[Bug 1770044] Re: plasmashell crashes on login - so I can't use my desktop system.

[Timon Michel]

Mikasa

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[Bug 1770044] Re: plasmashell crashes on login - so I can't use my desktop system.

[Timon Michel]

Mikasa

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[Bug 1770044] Re: plasmashell crashes on login - so I can't use my desktop system.

[Timon Michel]

I'm sorry, i misunderstood the text box "comment" as an internal comment
for myself. Can i delete it somehow?

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[Bug 1770044] Re: plasmashell crashes on login - so I can't use my desktop system.

[Patrick Gillespie]

For what it's worth, this bug is still present in Kubuntu 20.04.
Deleting Print-Manager and reinstalling after reboot (and deleting
printers) ---as advised above--- seems to have solved the problem---for
now.

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[Bug 1770044] Re: plasmashell crashes on login - so I can't use my desktop system.

[Launchpad Bug Tracker]

Status changed to 'Confirmed' because the bug affects multiple users.

** Changed in: print-manager (Ubuntu Bionic)
   Status: New => Confirmed

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[Bug 1770044] Re: plasmashell crashes on login - so I can't use my desktop system.

[Launchpad Bug Tracker]

Status changed to 'Confirmed' because the bug affects multiple users.

** Changed in: print-manager (Ubuntu Eoan)
   Status: New => Confirmed

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[Bug 1770044] Re: plasmashell crashes on login - so I can't use my desktop system.

[Gordon Lack]

>>> This is incorrect, as I've just had it happen to me (again) and I'm
using Eoan.

Although if that actually meant the problem wasn't with plasma-workspace but 
rather with print-manager then I disagree.
Clearly plasma-workspace has the ability to crash when presented with incorrect 
data. That itself is a bug! Applications should validate their input and handle 
errors appropriately. A crash is not an appropriate handling.

Also, will the Focal fix be backported to the earlier, still suffering
releases?

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[Bug 1770044] Re: plasmashell crashes on login - so I can't use my desktop system.

[Gordon Lack]

>>> no longer affects:  plasma-workspace (Ubuntu Eoan)

This is incorrect, as I've just had it happen to me (again) and I;m
using Eoan.

Here is my print queue:

[gmllaptop]: lpstat -R
  0 MFCJ6930DW-111gml4410   1024 Fri 24 Jan 2020 17:14:13 GMT
  1 MFCJ6930DW-111gml4410   1024 Fri 24 Jan 2020 17:14:13 GMT
  2 MFCJ6930DW-111gml4410   1024 Fri 24 Jan 2020 17:14:13 GMT

Note that despite the time (>9 days ago) it only caused the problem just
now (I suspect at approximately the midnight rollover from Sunday Feb
2nd to Monday 3rd).

A "cancel -x -a" has removed these records and my laptop is now OK
again.

Attached is the saved crash text file.

** Attachment added: "plasmashell-20200203-000819.kcrash.txt"
   
https://bugs.launchpad.net/ubuntu/+source/plasma-workspace/+bug/1770044/+attachment/5324881/+files/plasmashell-20200203-000819.kcrash.txt

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[Bug 1770044] Re: plasmashell crashes on login - so I can't use my desktop system.

[Rik Mills]

** Changed in: plasma-workspace (Ubuntu)
   Status: Confirmed => Invalid

** Also affects: print-manager (Ubuntu Focal)
   Importance: Undecided
   Status: Confirmed

** Also affects: plasma-workspace (Ubuntu Focal)
   Importance: Undecided
   Status: Invalid

** Also affects: print-manager (Ubuntu Bionic)
   Importance: Undecided
   Status: New

** Also affects: plasma-workspace (Ubuntu Bionic)
   Importance: Undecided
   Status: New

** Also affects: print-manager (Ubuntu Eoan)
   Importance: Undecided
   Status: New

** Also affects: plasma-workspace (Ubuntu Eoan)
   Importance: Undecided
   Status: New

** No longer affects: plasma-workspace (Ubuntu Bionic)

** No longer affects: plasma-workspace (Ubuntu Eoan)

** No longer affects: plasma-workspace (Ubuntu Focal)

** Changed in: print-manager (Ubuntu Focal)
   Status: Confirmed => Fix Released

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[Bug 1770044] Re: plasmashell crashes on login - so I can't use my desktop system.

[Bug Watch Updater]

** Changed in: print-manager
   Status: Confirmed => Fix Released

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[Bug 1770044] Re: plasmashell crashes on login - so I can't use my desktop system.

[vmagnin]

The bug is still present in Kubuntu 19.10 (KDE Plasma 5.16.5), and it
appeared two years ago in Kubuntu 17.10.

I have reinstalled the package print-manager on my notebook to install a
new printer, but I was obliged to remove print-manager after plasma
crashed when trying to print as the Wi-Fi was off.

Note that without the print-manager, I can not add printers but I can
still print on already installed printers. So you can install print-
manager each time you need to manage a new printer then uninstall the
package.

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[Bug 1770044] Re: plasmashell crashes on login - so I can't use my desktop system.

[Launchpad Bug Tracker]

Status changed to 'Confirmed' because the bug affects multiple users.

** Changed in: print-manager (Ubuntu)
   Status: New => Confirmed

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[Bug 1770044] Re: plasmashell crashes on login - so I can't use my desktop system.

[Bug Watch Updater]

Launchpad has imported 32 comments from the remote bug at
https://bugs.kde.org/show_bug.cgi?id=326289.

If you reply to an imported comment from within Launchpad, your comment
will be sent to the remote bug automatically. Read more about
Launchpad's inter-bugtracker facilities at
https://help.launchpad.net/InterBugTracking.


On 2013-10-19T20:07:38+00:00 Piotr Kęplicz wrote:

Application: plasma-desktop (4.11.2)
KDE Platform Version: 4.11.2
Qt Version: 4.8.4
Operating System: Linux 3.11.0-12-generic i686
Distribution: Ubuntu 13.10

-- Information about the crash:
- What I was doing when the application crashed:

I started printing some documents and before the printing job finished,
I modified printer applet settings so that it would show finished jobs
also. It crashed plasma-desktop, restarting it causes crash again.

The crash can be reproduced sometimes.

-- Backtrace:
Application: Powłoka pulpitu Plazmy (plasma-desktop), signal: Segmentation fault
Using host libthread_db library "/lib/i386-linux-gnu/libthread_db.so.1".
[Current thread is 1 (Thread 0xb1277740 (LWP 5114))]

Thread 5 (Thread 0xad787b40 (LWP 5115)):
#0  0xb772a424 in __kernel_vsyscall ()
#1  0xb20e184b in pthread_cond_wait@@GLIBC_2.3.2 () at 
../nptl/sysdeps/unix/sysv/linux/i386/i686/../i486/pthread_cond_wait.S:187
#2  0xb75de9bc in __pthread_cond_wait (cond=0xb31e38d0, mutex=0xb31e38b8) at 
forward.c:149
#3  0xb30e0ef2 in ?? () from /usr/lib/i386-linux-gnu/libQtScript.so.4
#4  0xb30e0f3f in ?? () from /usr/lib/i386-linux-gnu/libQtScript.so.4
#5  0xb20ddd78 in start_thread (arg=0xad787b40) at pthread_create.c:311
#6  0xb75d101e in clone () at ../sysdeps/unix/sysv/linux/i386/clone.S:131

Thread 4 (Thread 0xa6a9db40 (LWP 5116)):
#0  0xb75deba7 in pthread_mutex_lock (mutex=0xa6100558) at forward.c:192
#1  0xb200bba0 in g_mutex_lock (mutex=mutex@entry=0xa61004e0) at 
/build/buildd/glib2.0-2.38.0/./glib/gthread-posix.c:213
#2  0xb1fc858b in g_main_context_check (context=context@entry=0xa61004e0, 
max_priority=2147483647, fds=fds@entry=0xa6102288, n_fds=n_fds@entry=1) at 
/build/buildd/glib2.0-2.38.0/./glib/gmain.c:3558
#3  0xb1fc8aea in g_main_context_iterate (context=context@entry=0xa61004e0, 
block=block@entry=1, dispatch=dispatch@entry=1, self=) at 
/build/buildd/glib2.0-2.38.0/./glib/gmain.c:3709
#4  0xb1fc8c98 in g_main_context_iteration (context=0xa61004e0, may_block=1) at 
/build/buildd/glib2.0-2.38.0/./glib/gmain.c:3773
#5  0xb603a8df in QEventDispatcherGlib::processEvents (this=0xa6100468, 
flags=...) at kernel/qeventdispatcher_glib.cpp:426
#6  0xb60099f3 in QEventLoop::processEvents (this=this@entry=0xa6a9d228, 
flags=...) at kernel/qeventloop.cpp:149
#7  0xb6009d19 in QEventLoop::exec (this=this@entry=0xa6a9d228, flags=...) at 
kernel/qeventloop.cpp:204
#8  0xb5ef8e3d in QThread::exec (this=this@entry=0xa831688) at 
thread/qthread.cpp:542
#9  0xb5fe9e14 in QInotifyFileSystemWatcherEngine::run (this=0xa831688) at 
io/qfilesystemwatcher_inotify.cpp:265
#10 0xb5efb72f in QThreadPrivate::start (arg=0xa831688) at 
thread/qthread_unix.cpp:338
#11 0xb20ddd78 in start_thread (arg=0xa6a9db40) at pthread_create.c:311
#12 0xb75d101e in clone () at ../sysdeps/unix/sysv/linux/i386/clone.S:131

Thread 3 (Thread 0xa53ffb40 (LWP 5118)):
#0  0xb772a424 in __kernel_vsyscall ()
#1  0xb75c1a0b in poll () at ../sysdeps/unix/syscall-template.S:81
#2  0xb1fd7a3b in poll (__timeout=__timeout@entry=-1, __nfds=__nfds@entry=1, 
__fds=__fds@entry=0xa4a023a0) at /usr/include/i386-linux-gnu/bits/poll2.h:46
#3  g_poll (fds=fds@entry=0xa4a023a0, nfds=nfds@entry=1, 
timeout=timeout@entry=-1) at /build/buildd/glib2.0-2.38.0/./glib/gpoll.c:132
#4  0xb1fc8b58 in g_main_context_poll (priority=2147483647, n_fds=1, 
fds=0xa4a023a0, timeout=-1, context=0xa5408d10) at 
/build/buildd/glib2.0-2.38.0/./glib/gmain.c:4006
#5  g_main_context_iterate (context=0xa5408d10, block=block@entry=1, 
dispatch=dispatch@entry=1, self=) at 
/build/buildd/glib2.0-2.38.0/./glib/gmain.c:3707
#6  0xb1fc903b in g_main_loop_run (loop=0xa5408cd8) at 
/build/buildd/glib2.0-2.38.0/./glib/gmain.c:3906
#7  0xa5e1a0ea in gdbus_shared_thread_func (user_data=0xa5408cf8) at 
/build/buildd/glib2.0-2.38.0/./gio/gdbusprivate.c:278
#8  0xb1feec3a in g_thread_proxy (data=0xa8affb0) at 
/build/buildd/glib2.0-2.38.0/./glib/gthread.c:798
#9  0xb20ddd78 in start_thread (arg=0xa53ffb40) at pthread_create.c:311
#10 0xb75d101e in clone () at ../sysdeps/unix/sysv/linux/i386/clone.S:131

Thread 2 (Thread 0xa1135b40 (LWP 5121)):
#0  0xb772a424 in __kernel_vsyscall ()
#1  0xb75bf8db in read () at ../sysdeps/unix/syscall-template.S:81
#2  0xb200ad3e in read (__nbytes=16, __buf=0xa113507c, __fd=) at 
/usr/include/i386-linux-gnu/bits/unistd.h:44
#3  g_wakeup_acknowledge (wakeup=0xa4a051b0) at 
/build/buildd/glib2.0-2.38.0/./glib/gwakeup.c:212
#4  0xb1fc864b in g_main_context_check (context=context@entry=0xa540a230, 
max_priority=2147483647, 

[Bug 1770044] Re: plasmashell crashes on login - so I can't use my desktop system.

[Rik Mills]

** Also affects: print-manager (Ubuntu)
   Importance: Undecided
   Status: New

** Bug watch added: KDE Bug Tracking System #326289
   https://bugs.kde.org/show_bug.cgi?id=326289

** Also affects: print-manager via
   https://bugs.kde.org/show_bug.cgi?id=326289
   Importance: Unknown
   Status: Unknown

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[Bug 1770044] Re: plasmashell crashes on login - so I can't use my desktop system.

[Matthias Hadlich]

Confirmed on KDE Neon 5.15.1. Might be due to a network printer which
was recognized automatically but now no longer exists. The fixes
mentioned above (uninstalling the print-manager) appears to work.


[ 5748.844786] plasmashell[10378]: segfault at 0 ip 7f9c5c597a50 sp 
7ffd24d6a2f0 error 4 in libkcupslib.so[7f9c5c557000+56000]


Also my logs indicate that this might be related to an AppArmor issue with the 
/usr/sbin/cupsd profile. There are multiple denied entries in the logs whichof 
I have appended one. Afterwards there is the segfault in libkcupslib. 


syslog:Feb 26 18:55:13 matteo-whatever kernel: [ 5090.165402] audit: type=1400 
audit(1551203713.010:42): apparmor="DENIED" operation="file_lock" 
profile="/usr/sbin/cupsd" name="/run/utmp" pid=1420 comm="cupsd" 
requested_mask="k" denied_mask="k" fsuid=0 ouid=0
syslog:Feb 26 18:58:11 matteo-whatever kernel: [ 5268.663312] 
plasmashell[4392]: segfault at 0 ip 7f1ee3c3ea50 sp 7ffdafee0690 error 
4 in libkcupslib.so[7f1ee3bfe000+56000]

After reinstalling the logs have changed and the "denied" entries have been 
changed into "allowed":
syslog:Feb 26 19:06:11 matteo-whatever kernel: [ 5748.809771] audit: type=1400 
audit(1551204371.662:52): apparmor="ALLOWED" operation="capable" 
profile="/usr/sbin/cupsd" pid=1420 comm="cupsd" capability=12  
capname="net_admin"


My system: 
Operating System: KDE neon 5.15
KDE Plasma Version: 5.15.1
KDE Frameworks Version: 5.55.0
Qt Version: 5.12.0
Kernel Version: 4.15.12-041512-generic
OS Type: 64-bit
Processors: 8 × Intel® Core™ i7-6700HQ CPU @ 2.60GHz
Memory: 15.5 GiB of RAM

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[Bug 1770044] Re: plasmashell crashes on login - so I can't use my desktop system.

[Claudio Nold]

Same here (Kubuntu 18.04.01) - after removing blocked print jobs in CUPS
service UI (http://localhost:631/) plasmashell started. Here is my gdb
backtrace from the crash before:

cl@supertux:~$ gdb /usr/bin/plasmashell
GNU gdb (Ubuntu 8.1-0ubuntu3) 8.1.0.20180409-git
Copyright (C) 2018 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later 
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-linux-gnu".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
.
Find the GDB manual and other documentation resources online at:
.
For help, type "help".
Type "apropos word" to search for commands related to "word"...
Reading symbols from /usr/bin/plasmashell...(no debugging symbols found)...done.
(gdb) r
Starting program: /usr/bin/plasmashell 
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[New Thread 0x7fffe1caa700 (LWP 5836)]
[New Thread 0x7fffdb713700 (LWP 5837)]
[New Thread 0x7fffd9cce700 (LWP 5838)]
org.kde.plasmaquick: Applet preload policy set to 1
[New Thread 0x7fffd3bb5700 (LWP 5839)]
[New Thread 0x7fffd1b58700 (LWP 5840)]
Warning: all files used by qml by the plasmoid should be in ui/. The file in 
the path 
"file:///usr/share/plasma/plasmoids/org.kde.desktopcontainment/contents/code/LayoutManager.js"
 was expected at 
QUrl("file:///usr/share/plasma/plasmoids/org.kde.desktopcontainment/contents/ui/LayoutManager.js")
Warning: all files used by qml by the plasmoid should be in ui/. The file in 
the path 
"file:///usr/share/plasma/plasmoids/org.kde.desktopcontainment/contents/code/FolderTools.js"
 was expected at 
QUrl("file:///usr/share/plasma/plasmoids/org.kde.desktopcontainment/contents/ui/FolderTools.js")
[New Thread 0x7fff3e1f6700 (LWP 5841)]
trying to show an empty dialog
trying to show an empty dialog
org.kde.plasmaquick: New Applet  "Application Launcher" with a weight of 100
Connecting to deprecated signal 
QDBusConnectionInterface::serviceOwnerChanged(QString,QString,QString)
Trying to use rootObject before initialization is completed, whilst using 
setInitializationDelayed. Forcing completion
Both point size and pixel size set. Using pixel size.
Both point size and pixel size set. Using pixel size.
Both point size and pixel size set. Using pixel size.
trying to show an empty dialog
org.kde.plasmaquick: New Applet  "Digital Clock" with a weight of 50
Warning: all files used by qml by the plasmoid should be in ui/. The file in 
the path 
"file:///usr/share/plasma/plasmoids/org.kde.panel/contents/code/LayoutManager.js"
 was expected at 
QUrl("file:///usr/share/plasma/plasmoids/org.kde.panel/contents/ui/LayoutManager.js")
trying to show an empty dialog
org.kde.plasmaquick: Delayed preload of  "Application Launcher" after 0 seconds
KAStatsFavoritesModel::setFavorites is ignored
KActivities: Database connection:  
"kactivities_db_resources_140737353652224_readonly" 
query_only:  QVariant(qlonglong, 1) 
journal_mode:QVariant(QString, "wal") 
wal_autocheckpoint:  QVariant(qlonglong, 100) 
synchronous: QVariant(qlonglong, 0)
Entry is not valid "kontact.desktop" 0x5863ca40
Entry is not valid "ktp-contactlist.desktop" 0x5863ca40
Entry is not valid "kontact.desktop" 0x5863ca40
Entry is not valid "ktp-contactlist.desktop" 0x5863ca40
Closing SQL connection:  "kactivities_db_resources_140737353652224_readonly"
trying to show an empty dialog
org.kde.plasmaquick: Applet "Application Launcher" loaded after 73 msec
org.kde.plasmaquick: New Applet  "Audio Volume" with a weight of 50
org.kde.plasmaquick: New Applet  "Clipboard" with a weight of 50
org.kde.plasmaquick: New Applet  "Device Notifier" with a weight of 50
org.kde.plasmaquick: New Applet  "KDE Connect" with a weight of 50
Warning: all files used by qml by the plasmoid should be in ui/. The file in 
the path 
"file:///usr/share/plasma/plasmoids/org.kde.plasma.notifications/contents/code/uiproperties.js"
 was expected at 
QUrl("file:///usr/share/plasma/plasmoids/org.kde.plasma.notifications/contents/ui/uiproperties.js")
org.kde.plasmaquick: New Applet  "Notifications" with a weight of 50
[New Thread 0x7fff27a04700 (LWP 5842)]
libkcups: Create-Printer-Subscriptions last error: 0 successful-ok
org.kde.plasmaquick: New Applet  "Printers" with a weight of 50
libkcups: Get-Jobs last error: 0 successful-ok
libkcups: Get-Jobs last error: 0 successful-ok
org.kde.plasmaquick: New Applet  "Updates" with a weight of 50
org.kde.plasmaquick: New Applet  "Vaults" with a weight of 50
Plasma Shell startup completed
libkcups: 4

Thread 1 "plasmashell" received signal SIGSEGV, Segmentation fault.

[Bug 1770044] Re: plasmashell crashes on login - so I can't use my desktop system.

[László Szalma]

I confirm the error (segfault in dmesg) on kubuntu 18.10. Removing the
printer spool (/var/spool/cups/*) temporarily fixes the problem.
Removing print-manager solved the problem (with the caveats mentioned
above - no notify etc.)

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[Bug 1770044] Re: plasmashell crashes on login - so I can't use my desktop system.

[fab]

As suggested by @GordonLack I observe that also in a desktop pc it had
happened an operation like this immediately before the manifestation of
the symptom, precisely the request for a print preview from an
application which, however, had not set a program to be used to manage
the display. This event is therefore almost certainly the origin of the
bug.

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[Bug 1770044] Re: plasmashell crashes on login - so I can't use my desktop system.

[Hummel, Martin]

The same at me:
plasmashell[2492]: segfault at 0 ip 7ff4d97b4556 sp 7ffc42745ad0 error 
4 in libkcupslib.so[7ff4d9778000+55000]

4.15.0-43-generic

It seems the bug is unresolved since a half year.

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[Bug 1770044] Re: plasmashell crashes on login - so I can't use my desktop system.

[Thomas Ribbrock]

Correction to comment #17 - the "vanishing" printer was due to something
else, please disregard that part.

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[Bug 1770044] Re: plasmashell crashes on login - so I can't use my desktop system.

[Thomas Ribbrock]

Another +1

In my case, plasmashell started crashing like this after I had some
problems with printing a document two days back. When I started the PC
today (Kubuntu 18.04), plasmashell would keep crashing with the error
messages outlined above.

After reading this bug report, I did some digging and found the
following:

- One of the attempts of printing the document apparently resulted in a "stuck" 
print job in CUPS
- That job was listed twice with the same ID
- I could cancel one of them, but not the other one, as it had the same ID
- After manually removing the stuck job from /var/spool/cups and rebooting the 
PC, everything worked again
- Strangely enough, one of the two printers I had previously configured has now 
vanished completely from CUPS

So, the root cause seems to lie in CUPS rather than KDE, but I find it
extremely puzzling that an error in CUPS keeps KDE from starting
properly - this seems to be a bug in itself.

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[Bug 1770044] Re: plasmashell crashes on login - so I can't use my desktop system.

[Andreas John]

+1 from me.

I sopped cups via systemctl, then the plasmashell and the taskbar came
up again. I disabled the printer status notification in system settings,
now plasmashell and printing is working (but without notifiy).

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[Bug 1770044] Re: plasmashell crashes on login - so I can't use my desktop system.

[Cristian Arteaga]

Similar behavior in Kubuntu 18.04. Today I sent a print job to a non existing 
printer and in the next reboot, plasmashell did not start, I only got a black 
screen. 
Removing print-manager fixed the issue for now.

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[Bug 1770044] Re: plasmashell crashes on login - so I can't use my desktop system.

[Buddy Butterfly]

Btw. I was shocked that a bug in a component could bring down the whole plasma 
shell. Where is the
design goal of decoupling of components? I mean, I love KDE, but KDEs quality 
seems to be dependent
on every little app running there? Oh my goodness I would have expected a 
list of components with its status. Something like (unloaded, loaded, active, 
broken, etc.), but KDE running up and being stable. Something like osgi for 
KDE? ;-)

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[Bug 1770044] Re: plasmashell crashes on login - so I can't use my desktop system.

[vmagnin]

Yes, Zaur's post is interesting: it explains why I encountered that
problem only on my laptop (which I use at home and at work with several
printers), and not on my desktop machines.

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[Bug 1770044] Re: plasmashell crashes on login - so I can't use my desktop system.

[Gordon Lack]

>> In case it helps, I printed today to a non-existing printer. (Or not 
>> connected now)
>> This might be the reason.

That's interesting. The system on which I had the problem also had an "unusual" 
printer defined.
I have a Brother printer/scanner, so add the Brother-supplied driver (more 
options - needed for the scanner). I then try to prevent cups from finding the 
device on the network and adding another printer entry by manually editing 
cups-browsed.conf to add BrowseDeny entries, but that doesn't always seem to 
work.
So it's possible that when I re-installed the OS (see #4) I did this in a way 
which worked differently.

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[Bug 1770044] Re: plasmashell crashes on login - so I can't use my desktop system.

[Zaur Molotnikov]

Deleting the non-existing printer from printers helped:
1) Delete print-manager 
$ apt-get remove print-manager
2) Start plasma
sudo service sddm restart
or
kstart plasmashell
3) Install print-manager back again
$ apt-get install print-manager
4) Open Printers
Alt-F2 -> Printers
Remove the not used printers or all of them and then install the used ones.

"Fixed"
A software fix is still necessary.

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[Bug 1770044] Re: plasmashell crashes on login - so I can't use my desktop system.

[Zaur Molotnikov]

Hello.

I have encoutered this bug today.

Confirming that the removing of print-manager solves it.
In case it helps, I printed today to a non-existing printer. (Or not connected 
now)
This might be the reason.

System info:
===
$ uname -a
Linux xx 4.15.0-32-generic #35-Ubuntu SMP Fri Aug 10 17:58:07 UTC 2018 
x86_64 x86_64 x86_64 GNU/Linux
===
$ cat /etc/lsb-release 
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=18.04
DISTRIB_CODENAME=bionic
DISTRIB_DESCRIPTION="Ubuntu 18.04.1 LTS"
===


===
$ cat /var/log/syslog | grep libkcups
Aug 23 19:09:40  kernel: [   21.796551] plasmashell[2806]: segfault at 0 ip 
7f06228bf556 sp 7ffda5944a00 error 4 in 
libkcupslib.so[7f0622883000+55000]
Aug 23 19:11:58  kernel: [  159.541136] plasmashell[3142]: segfault at 0 ip 
7fb9f90eb556 sp 7ffd1f9dc550 error 4 in 
libkcupslib.so[7fb9f90af000+55000]
Aug 23 19:12:24  kernel: [  185.479028] plasmashell[3190]: segfault at 0 ip 
7fe7ae4b3556 sp 7ffddf141da0 error 4 in 
libkcupslib.so[7fe7ae477000+55000]
Aug 23 19:13:20  kernel: [  241.740921] plasmashell[3907]: segfault at 0 ip 
7f90b4e6e556 sp 7fff15942bc0 error 4 in 
libkcupslib.so[7f90b4e32000+55000]
Aug 23 19:17:15  kernel: [   21.434726] plasmashell[2561]: segfault at 0 ip 
7f679fd09556 sp 7ffcfd0279a0 error 4 in 
libkcupslib.so[7f679fccd000+55000]
Aug 23 19:25:00  kernel: [  486.744808] plasmashell[19246]: segfault at 0 
ip 7f35a96d5556 sp 7fff5621e720 error 4 in 
libkcupslib.so[7f35a9699000+55000]
Aug 23 19:30:31  kernel: [  817.724261] plasmashell[23856]: segfault at 0 
ip 7fbc4b29d556 sp 7ffe87f7e930 error 4 in 
libkcupslib.so[7fbc4b261000+55000]
Aug 23 19:31:22  kernel: [  868.486032] plasmashell[24483]: segfault at 0 
ip 7f10fc9b2556 sp 7ffe7b7f9890 error 4 in 
libkcupslib.so[7f10fc976000+55000]
==

$ dpkg -l | egrep "plasma"
rc  kdeconnect-plasma   1.3.1-0ubuntu0.1
all  Transitional package (kdeconnect-plasma -> 
kdeconnect)
ii  kdeplasma-addons-data   4:5.12.6-0ubuntu0.1 
all  locale files for kdeplasma-addons
ii  libkdeclarative54:4.14.38-0ubuntu3  
amd64declarative library for plasma
ii  libkf5plasma5:amd64 5.44.0-0ubuntu3 
amd64Plasma Runtime components
ii  libkf5plasmaquick5:amd645.44.0-0ubuntu3 
amd64Plasma Runtime components
ii  libplasma-geolocation-interface54:5.12.6-0ubuntu0.1 
amd64Plasma Workspace for KF5 library
ii  libplasma3  4:4.14.38-0ubuntu3  
amd64Plasma Library for the KDE Platform
ii  plasma-dataengines-addons   4:5.12.6-0ubuntu0.1 
amd64additional data engines for Plasma
ii  plasma-desktop  4:5.12.6-0ubuntu0.1 
amd64Tools and widgets for the desktop
ii  plasma-desktop-data 4:5.12.6-0ubuntu0.1 
all  Tools and widgets for the desktop data files
ii  plasma-discover 5.12.6-0ubuntu0.1   
amd64Discover software management suite
ii  plasma-discover-common  5.12.6-0ubuntu0.1   
all  Discover software manager suite (common data files)
rc  plasma-discover-private 5.6.2-1ubuntu1.1
amd64Private runtime libraries for the Discover suite
ii  plasma-framework5.44.0-0ubuntu3 
amd64Plasma Runtime components
ii  plasma-integration  5.12.6-0ubuntu0.1   
amd64Qt Platform Theme integration plugins for KDE 
Plasma
ii  plasma-look-and-feel-org-kde-breezedark-desktop 4:5.12.6-0ubuntu0.1 
all  Dark Breeze look-and-feel for Plasma
ii  plasma-nm   4:5.12.6-0ubuntu0.1 
amd64Plasma5 networkmanager library.
ii  plasma-pa   4:5.12.6-0ubuntu0.1 
amd64Plasma 5 Volume controller
ii  plasma-runners-addons   4:5.12.6-0ubuntu0.1 
amd64additional runners for Plasma 5 and Krunner
ii  plasma-scriptengine-javascript  4:17.08.3-0ubuntu1  
amd64JavaScript script engine for Plasma
ii  

[Bug 1770044] Re: plasmashell crashes on login - so I can't use my desktop system.

[Steve Baker]

I can confirm same exact problems as Sergey on a computer that was once
a Dell XPS, but has been through so many upgrades, the only original
part may now be the power cord!

Uninstalling the print-manager fixed it.

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[Bug 1770044] Re: plasmashell crashes on login - so I can't use my desktop system.

[Luca Morandini]

Same issue here with Kubuntu 18.04 on an HP EliteBook.

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[Bug 1770044] Re: plasmashell crashes on login - so I can't use my desktop system.

[Sergey Tryuber]

Exactly the same issue. Plasmashell segfault with "error 4 in
libkcupslib.so". Black screen after login, all hot keys work, ALT+F2
works, but no desktop GUI. Removing "print-manager" fixed issue, but
this is a hotfix.

My system (if helps):
- Dell XPS 2-in-1
- Kubuntu 17.10 that was staying in my PC for last few months and that was 
initially grown up from Kubuntu 16.04. 
- Looks like the bug came in one of last updates.
- First that I did when saw no GUI after reboot - upgraded to 18.04 with a 
hope, that upgrade will overwrite buggy pages. But the issue remained.
- Cleaning up ".config" directory or creation of a new user does not work. New 
user accounts do not have GUI either.

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[Bug 1770044] Re: plasmashell crashes on login - so I can't use my desktop system.

[vmagnin]

I first encountered that bug when installing Kubuntu 17.10 on my HP
Zbook. I found a turnaround (see below) but the bug reappeared today
after upgrading to Kubuntu 18.04.

The segfault appears in libkcupslib.so, which is in the print-manager package:
$ apt-file search libkcupslib.so
print-manager: /usr/lib/x86_64-linux-gnu/libkcupslib.so

So I removed it:
$ sudo apt-get remove print-manager

After reboot or relogging, plasma is now working.
The problem is that I can't print anymore. And if I reinstall print-manager the 
bug is back.

Note that I installed Kubuntu 17.10 & 18.04 on 5 machines, and the bug
appears only on my HP Zbook.

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[Bug 1770044] Re: plasmashell crashes on login - so I can't use my desktop system.

[Launchpad Bug Tracker]

Status changed to 'Confirmed' because the bug affects multiple users.

** Changed in: plasma-workspace (Ubuntu)
   Status: New => Confirmed

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[Bug 1770044] Re: plasmashell crashes on login - so I can't use my desktop system.

[Gordon Lack]

I've had to reinstall 18.04 on this system to make it usable.
It now works - with (essentially) the same configuration and with no change to 
my $HOME files.

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[Bug 1770044] Re: plasmashell crashes on login - so I can't use my desktop system.

[Gordon Lack]

I've found the two attached crash files for this issue in /var/crash/


** Attachment added: "crashes.tar.gz"
   
https://bugs.launchpad.net/ubuntu/+source/plasma-workspace/+bug/1770044/+attachment/5136461/+files/crashes.tar.gz

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[Bug 1770044] Re: plasmashell crashes on login - so I can't use my desktop system.

[Gordon Lack]

A few other things.

The affect system has these cups processes running:

root@parent:/local/configs/packages# ps -ef | grep cups
root  3421 1  0 01:49 ?00:00:00 /usr/sbin/cupsd -l
lp3423  3421  0 01:49 ?00:00:00 /usr/lib/cups/notifier/dbus 
dbus://
lp3424  3421  0 01:49 ?00:00:00 /usr/lib/cups/notifier/dbus 
dbus://
lp3425  3421  0 01:49 ?00:00:00 /usr/lib/cups/notifier/dbus 
dbus://
lp3426  3421  0 01:49 ?00:00:00 /usr/lib/cups/notifier/dbus 
dbus://
lp3427  3421  0 01:49 ?00:00:00 /usr/lib/cups/notifier/dbus 
dbus://
lp3428  3421  0 01:49 ?00:00:00 /usr/lib/cups/notifier/dbus 
dbus://
lp3429  3421  0 01:49 ?00:00:00 /usr/lib/cups/notifier/dbus 
dbus://
lp3430  3421  0 01:49 ?00:00:00 /usr/lib/cups/notifier/dbus 
dbus://
lp3431  3421  0 01:49 ?00:00:00 /usr/lib/cups/notifier/dbus 
dbus://
lp3432  3421  0 01:49 ?00:00:00 /usr/lib/cups/notifier/dbus 
dbus://
root  3434  2860  0 01:49 pts/100:00:00 grep 
cupsroot@parent:/local/configs/packages# ps -ef | grep cups
root  3421 1  0 01:49 ?00:00:00 /usr/sbin/cupsd -l
lp3423  3421  0 01:49 ?00:00:00 /usr/lib/cups/notifier/dbus 
dbus://
lp3424  3421  0 01:49 ?00:00:00 /usr/lib/cups/notifier/dbus 
dbus://
lp3425  3421  0 01:49 ?00:00:00 /usr/lib/cups/notifier/dbus 
dbus://
lp3426  3421  0 01:49 ?00:00:00 /usr/lib/cups/notifier/dbus 
dbus://
lp3427  3421  0 01:49 ?00:00:00 /usr/lib/cups/notifier/dbus 
dbus://
lp3428  3421  0 01:49 ?00:00:00 /usr/lib/cups/notifier/dbus 
dbus://
lp3429  3421  0 01:49 ?00:00:00 /usr/lib/cups/notifier/dbus 
dbus://
lp3430  3421  0 01:49 ?00:00:00 /usr/lib/cups/notifier/dbus 
dbus://
lp3431  3421  0 01:49 ?00:00:00 /usr/lib/cups/notifier/dbus 
dbus://
lp3432  3421  0 01:49 ?00:00:00 /usr/lib/cups/notifier/dbus 
dbus://
root  3434  2860  0 01:49 pts/100:00:00 grep cups

My laptop (the one I'm reporting from) which should be configured the
same) has:

[gmllaptop]: ps -ef | grep cups
root   984 1  0 01:07 ?00:00:00 /usr/sbin/cupsd -l
root  1032 1  0 01:08 ?00:00:00 /usr/sbin/cups-browsed
gml4410   7966  4133  0 01:45 pts/200:00:00 grep cups

My (failing) desktop is also reporting:

root@parent:/var/log# grep cups-browsed syslog | grep DENIED
May  9 00:58:44 parent kernel: [   39.940369] audit: type=1400 
audit(1525823924.302:22): apparmor="DENIED" operation="open" 
profile="/usr/sbin/cups-browsed" name="/local/lib/libunistring.so.2.0.0" 
pid=1133 comm="cups-browsed" requested_mask="r" denied_mask="r" fsuid=0 ouid=0
May  9 01:11:30 parent kernel: [   39.218176] audit: type=1400 
audit(1525824690.582:22): apparmor="DENIED" operation="open" 
profile="/usr/sbin/cups-browsed" name="/local/lib/libunistring.so.2.0.0" 
pid=1144 comm="cups-browsed" requested_mask="r" denied_mask="r" fsuid=0 ouid=0
May  9 01:24:22 parent kernel: [   40.002547] audit: type=1400 
audit(1525825462.362:22): apparmor="DENIED" operation="open" 
profile="/usr/sbin/cups-browsed" name="/local/lib/libunistring.so.2.0.0" 
pid=1158 comm="cups-browsed" requested_mask="r" denied_mask="r" fsuid=0 ouid=0

(which my laptop does not) - but it has been reporting this for a long
time.

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