Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: system-config-printer (Ubuntu)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/1917941
Title:
System-config-printer keeps asking for network printer credentials
Status in system-config-printer package in Ubuntu:
Confirmed
Bug description:
Hello.
I think I found a small bug in the printing process of Xubuntu
20.04.02 LTS. I have a networked laser printer (Xerox Phaser 3250)
that requires username/password credentials to print. The device is
present in the CUPS page (see the Printers page in
http://localhost:631) and uses the IPP protocol set to
"ipp://192.168.1.10:631/ipp" URI. It is also visible in the system-
config-printer window (XFCE Start button => Settings => Printers) and
is set as default printer. The printer username/password are different
than my PC username/password.
Anyway, I noticed that the OS will sometimes pester me to enter the
same credentials each time I try to print something. I recall the
printing authorization window does have a "Remember password" checkbox
that seemingly does nothing. Now why I am mentioning that this happens
only sometimes? It's because I noticed that different programs will
use different authorization windows to get printer credentials. For
example, Mousepad will try to get credentials by using a CUPS popup
dialog (I think). LibreOffice seems to popup its own small password
entry window. This bug only applies to the cases where the printing is
done via system-config-printer that uses its own authorization dialog.
The printing works fine after credentials are entered though.
So, after a short debug session I managed to narrow down the problem
to this file: /usr/share/system-config-printer/jobviewer.py. I ran the
applet.py and scp-dbus-service.py with the --debug option from command
line to get some extra debug messages. Printing from Mousepad did not
trigger any debug messages, but it did bring up the printing
authorization dialog regardless. Like I've previously stated, Mousepad
seems to use a different auth dialog, and I've verified (via seahorse)
that this dialog works properly because it correctly stores the
credentials into the keyring, and, if the Remember password checkbox
is ticked, remembers them next time I try to print something. The
problem only applies to the auth dialog triggered from jobviewer.py of
system-config-printer. I managed to trigger the jobviewer auth dialog
by trying to print something in LibreOffice Writer and then hitting
Cancel in the small window that pops up. This will then trigger the
*proper* jobviewer.py auth window to show up. It also triggers upon
boot when there is something queued to be printed.
It can also be reliably triggered queueing a print job, killing
scp-dbus-service.py and applet.py and re-running them in this order:
1) /usr/share/system-config-printer/scp-dbus-service.py --debug
2) /usr/share/system-config-printer/applet.py --debug
Though this jobviewer.py auth dialog will successfully save the printer
credentials to the keyring, if the checkbox is ticked (verified with Seahorse),
it will fail to read them next time, assume the credentials are missing, and
ask the user to enter them. The error appears to happen in jobviewer.py:
Line 1056: search_obj = ItemSearch(service, attrs)
This line causes the following error to appear in the terminal:
GLib-GIO-CRITICAL **: 19:28:31.663: g_dbus_connection_call_internal:
assertion 'G_IS_DBUS_CONNECTION (connection)' failed
The call fails to fetch any credentials and instead returns an empty
result. I've written a short python script (see test.py) that
reproduces the issue and triggers the same error.
Related libsecret documentation:
https://developer.gnome.org/libsecret/0.20/
ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: system-config-printer 1.5.12-0ubuntu1.1
ProcVersionSignature: Ubuntu 5.4.0-66.74-generic 5.4.86
Uname: Linux 5.4.0-66-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.11-0ubuntu27.16
Architecture: amd64
CasperMD5CheckResult: skip
CupsErrorLog:
CurrentDesktop: XFCE
Date: Fri Mar 5 19:34:54 2021
InstallationDate: Installed on 2020-01-20 (409 days ago)
InstallationMedia: Xubuntu 19.10 "Eoan Ermine" - Release amd64 (20191017)
Lpstat: device for Phaser-3250: ipp://192.168.1.10:631/ipp
Lsusb:
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 002: ID 046d:c069 Logitech, Inc. M-U0007 [Corded Mouse M500]
Bus 001 Device 003: ID 8087:0aaa Intel Corp.
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Lsusb-t:
/: Bus 02.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/8p, 10000M
/: Bus 01.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/16p, 480M
|__ Port 4: Dev 2, If 0, Class=Human Interface Device, Driver=usbhid,
1.5M
|__ Port 14: Dev 3, If 0, Class=Wireless, Driver=btusb, 12M
|__ Port 14: Dev 3, If 1, Class=Wireless, Driver=btusb, 12M
MachineType: Acer Predator PH317-52
PackageArchitecture: all
Papersize: a4
PpdFiles:
Error: command ['fgrep', '-H', '*NickName', '/etc/cups/ppd/Phaser.ppd',
'/etc/cups/ppd/Phaser-3250.ppd'] failed with exit code 2: grep:
/etc/cups/ppd/Phaser.ppd: Permission denied
grep: /etc/cups/ppd/Phaser-3250.ppd: Permission denied
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.4.0-66-generic
root=UUID=b1b80b22-4e8a-4fe5-9c0a-7716a49283e2 ro
cryptdevice=/dev/disk/by-partlabel/LUKS:cryptroot:allow-discards noresume quiet
splash vt.handoff=7
SourcePackage: system-config-printer
UpgradeStatus: Upgraded to focal on 2020-07-15 (233 days ago)
dmi.bios.date: 03/27/2019
dmi.bios.vendor: Insyde Corp.
dmi.bios.version: V1.26
dmi.board.asset.tag: Type2 - Board Serial Number
dmi.board.name: Sienna_CFS
dmi.board.vendor: CFL
dmi.board.version: V1.26
dmi.chassis.type: 10
dmi.chassis.vendor: Acer
dmi.chassis.version: V1.26
dmi.modalias:
dmi:bvnInsydeCorp.:bvrV1.26:bd03/27/2019:svnAcer:pnPredatorPH317-52:pvrV1.26:rvnCFL:rnSienna_CFS:rvrV1.26:cvnAcer:ct10:cvrV1.26:
dmi.product.family: Predator Helios 300
dmi.product.name: Predator PH317-52
dmi.product.sku: 0000000000000000
dmi.product.version: V1.26
dmi.sys.vendor: Acer
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