Public bug reported:
I'm reporting this against xorg, because of where the problem occurs, as
indicated below, I can't tell if the problem is with xorg, lightdm or
light-locker. The system is a Dell Optiplex 745 single-booting to
Xubuntu 20.04 up-to-date as of today.
I replaced one of 2 monitors, the one rotated to portrait orientation, with a
higher resolution monitor. Started the system, logged in as another user and
changed the desktop background however, when I then logged out and restarted
the system, it behaved normally until it displayed the usual
/dev/sda1: clean, x/x files, /x blocks
on both monitors. The prompt remained for a few seconds, slowly blinked off and
on 6 times, and then remained with no further activity. The system works fine
if I boot from a Xubuntu 18.04 DVD (I didn't have a 20.04 DVD, and this is the
only machine with a burner). On another machine, I determined that the system
was booting, because the machine was visible on the network, and its shared
folders were accessible.
I could get to a login prompt and log on using Alt+F1 to F6. Alt-F7
returned me to the file system check prompt. I was able to start xorg
after logging on with startx, and changing all settings for the new
monitor, everything worked normally until logging out, which of course
returned me to the command line where I had given the command startx.
If I log out requesting a restart, the system reboots, but still stops at the
same place every time. That behavior hadn't changed the next day. I can use the
machine, but only by selecting a terminal, logging as myself or the other user
and giving the startx command. I have been unable to find anything on the
Internet that corrects the problem. Since the problem first started, two
crashes have occurred and I allowed them to be reported; however, they were
light-locker crashes. I reinstalled lightdm and light-locker, but that made no
difference. I installed gdm3, which works fine, but switching back to lightdm
with:
sudo dpkg-reconfigure gdm3
sudo dpkg --configure lightdm
resulted in:
dpkg: error processing package lightdm (--configure):
package lightdm is already installed and configured
Errors were encountered while processing:
lightdm
So I can't really be sure if the problem is with xorg, lightdm or light-
locker, but since there are no error messages and everything else works
fine, it's clearly a bug, if a strange one. I do not relish the idea of
having to reinstall Xubuntu; so for the time being, I'll use gdm3,
though I prefer lightdm's ability to properly display backdrops and use
the two monitors properly extended (with gdm3, the mouse moves down the
left portrait monitor before moving onto the right monitor where gdm3
sees fit to put the logon dialog). The next thing I'll try is
autoremoving lightdm rebooting a few times and then reinstalling it...
Because of the absence of error messages and information even suggesting
why X isn't starting, I have no idea what other information about my
system might be useful to you, but if you need something additional,
I'll try to provide it.
ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: xorg 1:7.7+19ubuntu14
ProcVersionSignature: Ubuntu 5.4.0-65.73-generic 5.4.78
Uname: Linux 5.4.0-65-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.14
Architecture: amd64
BootLog: Error: [Errno 13] Permission denied: '/var/log/boot.log'
CasperMD5CheckResult: skip
CompositorRunning: None
CurrentDesktop: XFCE
Date: Fri Jan 29 22:12:37 2021
DistUpgraded: 2020-10-20 06:56:14,405 DEBUG Running PostInstallScript:
'./xorg_fix_proprietary.py'
DistroCodename: focal
DistroVariant: ubuntu
DkmsStatus:
virtualbox, 6.1.16, 5.4.0-62-generic, x86_64: installed
virtualbox, 6.1.16, 5.4.0-65-generic, x86_64: installed
ExtraDebuggingInterest: Yes
GraphicsCard:
Advanced Micro Devices, Inc. [AMD/ATI] RV620 LE [Radeon HD 3450] [1002:95c5]
(prog-if 00 [VGA controller])
Subsystem: Dell OptiPlex 980 [1028:0342]
InstallationDate: Installed on 2019-11-29 (427 days ago)
InstallationMedia: Xubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
MachineType: Dell Inc. OptiPlex 780
ProcEnviron:
TERM=xterm-256color
PATH=(custom, no user)
XDG_RUNTIME_DIR=
LANG=en_US.UTF-8
SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.4.0-65-generic
root=UUID=68c4f426-dc84-48e8-be0f-cd1a5acfb729 ro quiet splash vt.handoff=7
SourcePackage: xorg
UpgradeStatus: Upgraded to focal on 2020-10-20 (101 days ago)
dmi.bios.date: 08/06/2013
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A15
dmi.board.name: 0C27VV
dmi.board.vendor: Dell Inc.
dmi.board.version: A00
dmi.chassis.type: 6
dmi.chassis.vendor: Dell Inc.
dmi.modalias:
dmi:bvnDellInc.:bvrA15:bd08/06/2013:svnDellInc.:pnOptiPlex780:pvr:rvnDellInc.:rn0C27VV:rvrA00:cvnDellInc.:ct6:cvr:
dmi.product.name: OptiPlex 780
dmi.sys.vendor: Dell Inc.
version.compiz: compiz N/A
version.libdrm2: libdrm2 2.4.102-1ubuntu1~20.04.1
version.libgl1-mesa-dri: libgl1-mesa-dri 20.2.6-0ubunt
