Till Kamppeter @till-kamppeter
thank you so much for your help and the really great explanation of the
snap System itself, now all is working fine again.
sudo snap install cups
cups 2.4.11-3 from OpenPrinting✓ installed
snap connections | grep :cups
cups-control cups:cups-ho
ls -la /usr/lib/systemd/system/ | grep /dev/null
lrwxrwxrwx 1 root root 9 Apr 7 2024 alsa-utils.service -> /dev/null
lrwxrwxrwx 1 root root 9 Okt 17 19:15 cryptdisks-early.service -> /dev/null
lrwxrwxrwx 1 root root 9 Okt 17 19:15 cryptdisks.service -> /dev/null
lrwxrwxrwx 1 root
OK, the Snaps need the CUPS Snap to actually be able to print, so you
need to re-install it:
sudo snap install cups
I asked you to remove it to have better control on the recovery of the
system's CUPS, but now as we have re-established its original
configuration you can re-install the Snap.
"Do you have another machine (Linux or Mac) in your network which is
sharing the printer "Brother-Printer"?"
No, have only one Printer which is the recognized Network Printer ...
Will attach both in my next two comments
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here now the on friday requested error log when opening printer settings
in gnome-control-center.
No, i have nothing manually added, I got by unknown reasons always two
printers (added only the network version with the underscore name) and
both work ...
** Attachment added: "error_log.txt"
ht
Brother-Printer.ppd
** Attachment added: "Brother-Printer.ppd"
https://bugs.launchpad.net/ubuntu/+source/gnome-control-center/+bug/2083530/+attachment/5863832/+files/Brother-Printer.ppd
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** Attachment added: "Bildschirmfoto vom 2025-03-10 21-24-56.png"
https://bugs.launchpad.net/ubuntu/+source/gnome-control-center/+bug/2083530/+attachment/5863781/+files/Bildschirmfoto%20vom%202025-03-10%2021-24-56.png
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Could you run
ls -la /usr/lib/systemd/system/ | grep /dev/null
ls -la /etc/systemd/system/ | grep /dev/null
ls -la /var/run/systemd/system/ | grep /dev/null
and post the output here?
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now my printer is back but i can't set up anything, same as before all we did
...
See Screenshot
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Title:
gnome-control-center not able to add pr
Could you do:
sudo rm /etc/systemd/system/cups-browsed.service
sudo rm /etc/systemd/system/cups.socket
sudo systemctl start cups
cupsctl --debug-logging
lpstat -r
lpstat -v
lpstat -l -e
and post the output?
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Could you again run the commands of comment #31?
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Title:
gnome-control-center not able to add printer or make settings
To manage notifications a
okay only for completeness:
cupsctl --debug-logging
RESULTS NOTHING, ALSO NO ERRORS! ;-)
lpstat -r
Zeitplandienst läuft
lpstat -v
Gerät für Brother-Printer: ipp://Brother%20MFC-L2710DN%20series._ipp._tcp.local/
lpstat -l -e
Brother-Printer permanent ipp://localhost/print
Could you run
file /lib/systemd/system/cups.service
file /usr/lib/systemd/system/cups.service
and post the output here?
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Title:
gnome-c
ATTENTION: this time i pasted all commands in a single step in terminal,
so the result is all together for better readability
sudo dpkg -P --force-depends cups-daemon
sudo apt install cups-daemon
sudo systemctl start cups
cupsctl --debug-logging
lpstat -r
lpstat -v
lpstat -
Till Kamppeter @till-kamppeter
now I cannot print with the firefox-snap and thunderbird-snap anymore, maybe as
reason that we uninstalled the snap CUPS, right?
Firefox has no Printer in Printing Pulldown (only Print to pdf) and
thunderbird-snap shows correct both ("Brother-Printer" and
"Brother
Till Kamppeter @till-kamppeter
here:
sudo rm /lib/systemd/system/cups.service
sudo systemctl daemon-reload
systemctl status cups
○ cups.service - LSB: CUPS Printing spooler and server
Loaded: loaded (/etc/init.d/cups; generated)
Active: inactive (dead)
TriggeredBy: ● cups.path
And now please do the commands of comment #31.
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Title:
gnome-control-center not able to add printer or make settings
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Till Kamppeter @till-kamppeter
sudo dpkg -P --force-depends cups-daemon
dpkg: cups-daemon: Abhängigkeitsprobleme, wird aber wie gefordert dennoch
entfernt:
cups-core-drivers hängt ab von cups-daemon (>= 2.4.7-1.2ubuntu7.3).
cups-browsed hängt ab von cups-daemon.
cups hängt ab von cups-daemon (
Now we have cleaned up the mess of your use of "systemctl mask ..." and
of your attempt to replace your system's CUPS by the Snap of CUPS.
Next step is to investigate to find out what the actual bug is.
In the print dialog of your evince there are two entries. The second
entry, "BROTHER_MFC_L2710
printers.conf
** Attachment added: "printers.conf"
https://bugs.launchpad.net/ubuntu/+source/gnome-control-center/+bug/2083530/+attachment/5863826/+files/printers.conf
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Title:
gnome-control-center not able to add printer or make settings
To manage notifications about this bug go to:
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evince is now able to print again, last but not least the problem with
the printer settings in gnome-control-center ...
** Attachment added: "Bildschirmfoto vom 2025-03-10 21-36-30.png"
https://bugs.launchpad.net/ubuntu/+source/gnome-control-center/+bug/2083530/+attachment/5863782/+files/Bilds
Do you have another machine (Linux or Mac) in your network which is
sharing the printer "Brother-Printer"?
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Title:
gnome-control-center not able
here a last screenshot, this is what i see with systemconfig printers and KDE
Printers (?) ...
"Brother Printer" is the driverless Printer which is added automatically and
the underscored one is the manually added one for network printing
** Attachment added: "Bildschirmfoto vom 2025-03-10 22-36
Could you copy your files /etc/cups/printers.conf and
/etc/cups/ppd/Brother-Printer.ppd and attach them to this bug report?
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Title:
gnome-control
It seems that CUPS is still masked and it seems that by force-removing
and re-installing it one does not get it unmasked.
Did you execute the commands as I told you in comment #23?
Note that I have derived this command sequence from:
https://askubuntu.com/questions/804946/systemctl-how-to-un
sudo rm /etc/systemd/system/cups-browsed.service
NO RESULT
sudo rm /etc/systemd/system/cups.socket
NO RESULT
sudo systemctl start cups
Failed to start cups.service: Unit cups.socket is masked.
cupsctl --debug-logging
cupsctl: Kann nicht mit dem Server verbinden: Ungültige
Till Kamppeter @till-kamppeter please see my comment in #34
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Title:
gnome-control-center not able to add printer or make settings
To manage noti
Till Kamppeter @till-kamppeter
have now uninstalled cups as snap with `sudo snap remove --purge cups` and then
`cupsctl --debug-logging` results "cupsctl: Kann nicht mit dem Server
verbinden: Ungültiger Dateideskriptor" and gnome-control-center says "Kein
Druckdienst" but we have had installed
Sorry, I meant that you wanted to remove the CUPS Debian packages after
you have hit the bug. I have then guided you to get all back to its
original state, as replacing the original CUPS by the CUPS Snap could
perhaps work around the problem but does not allow us to investigate it.
And as for most
** Attachment added: "Screenshot to Comment #27"
https://bugs.launchpad.net/ubuntu/+source/gnome-control-center/+bug/2083530/+attachment/5863391/+files/Bildschirmfoto%20vom%202025-03-08%2012-47-04.png
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Till Kamppeter @till-kamppeter
"Marc has tried to get rid of the Debian packages of CUPS" this isn't true.
If Ubuntu 24.04.1 hadn't destroyed my printed stuff, I wouldn't have done
anything with it! Everything I did afterwards, I did out of forgiveness!
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Warning added to cups-snap repo ...
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Title:
gnome-control-center not able to add printer or make settings
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I'm a bit confused by the discussion. Why is the cups snap installed on
your system? It's not something we do by default in Ubuntu. Instead of
masking units why not just removing the snap to see if that resolves the
issue?
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Seb, you see here why the future lies in immutable distros, it is so
easy to create a complete mess with conventional ones ...
The steps were all an act of desperation. By stumbling over the cups-
snap repo on OpenPrinting (and therefore installing the CUPS Snap) Marc
has tried to get rid of the D
So first, please try to do as described in the question I linked (this
is the text from there but "translated" to CUPS):
-
First check that the unit file is a symlink to /dev/null
file /lib/systemd/system/cups.service
it should return:
/lib/systemd/system/cups.service: symbolic link
okay, thanks for explanation but what coming next?
We cannot leave a "broken" thing and go on ...
As I Upgraded to 24.04.1 LTS the Printing stuff (or systemd stuff) is going
broken and isn't fixed since then, and we are now on 24.04.2 LTS.
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For you the snapped CUPS daemon is running, not the one of the Debian
package. This means that principally you can print, especially as your
printer is driverless. Printer setup tools like system-config-printer
and KDE Print Manager can communicate with the CUPS daemon normally. You
only would see
`systemctl unmask ...` actually does not work. See this question on Ask
Ubuntu and the selected answer (green check mark) for it
https://askubuntu.com/questions/804946/systemctl-how-to-unmask
Seems to by a systemd bug.
But note that this is not your original GNOME problem. That problem
alread
"Can you post a screenshot of the main view of the print dialog of
evince, where one sees the list of available printers (not the print
preview)?"
Attached
cups do not debug since really long time ago, see attached screenshot
Yes, I'm admin for lpadmin "lpadmin:x:122:newcomer01"
** Attachment a
here:
newcomer01@newcomer01-MS-7A40:~$ ps aux | grep cups
root 677370 0.0 0.0 2892 1536 ?Ss 17:15 0:00 /bin/sh
/snap/cups/1070/scripts/run-cups-browsed
root 677377 0.0 0.0 2892 1536 ?Ss 17:15 0:00 /bin/sh
/snap/cups/1070/scripts/run-cupsd
root 677
For me it all seems like GNOME (and its underlying GUI library GTK) is
not able to fully access the printing system, but other applications,
desktops, and GUI libraries are able to fully access.
Could you set CUPS to debug logging:
cupsctl --debug-logging
and do 2 tests:
1. Open the print d
Could you run the command
ps aux | grep cups
and post the output here?
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Title:
gnome-control-center not able to add printer or make setting
** Attachment added: "Bildschirmfoto vom 2025-03-07 19-40-28.png"
https://bugs.launchpad.net/ubuntu/+source/gnome-control-center/+bug/2083530/+attachment/5863304/+files/Bildschirmfoto%20vom%202025-03-07%2019-40-28.png
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Also, are you in the "lpadmin" group? Check the /etc/group file.
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Title:
gnome-control-center not able to add printer or make settings
To manage
Can you post a screenshot of the main view of the print dialog of
evince, where one sees the list of available printers (not the print
preview)?
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T
The link to your evince screenshot does not work.
You can generally attach image files directly to Launchpad bug comments,
you do not need to use any third-party service to host images or other
files. Especially then the images keep conserved for the future as on
Launchpad there is no space limit,
Till Kamppeter @till-kamppeter
have made now your suggested steps, results below:
newcomer01@newcomer01-MS-7A40:~$ sudo snap stop cups
Gestoppt.
newcomer01@newcomer01-MS-7A40:~$ sudo apt install cups
Paketlisten werden gelesen… Fertig
Abhängigkeitsbaum wird aufgebaut… Fertig
Statusinformationen w
First, at least before your switched to the Snap package of CUPS, you
were able to use KDE Print Manager and system-config-printer to manager
your printer, create queues, set option defaults, ...?
And were you able to print from any application, including GNOME
applications like evince?
Where you
is someone working on this Bugs(s)? Or more detailed description needed?
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Title:
gnome-control-center not able to add printer or make settings
T
next issue found: https://ibb.co/znX2Tkp
If you enable the Dock, the slider goes for seconds to the right and jumps
immediately to left again (disables it agin).
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Sebastien Bacher ~seb128: this Bug is also related to other gnome Apps
like gnome-document-viewer (is it called so?). Here you also can't print
e.g. pdf-files. In my case: I see two printers and equal which one I
select, it gets not the current status to perform a print-job.
Please see:
https://ib
** Changed in: gnome-control-center (Ubuntu)
Status: Incomplete => New
** Changed in: gnome-control-center (Ubuntu)
Importance: Undecided => Low
** Also affects: cups (Ubuntu)
Importance: Undecided
Status: New
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FOREMOST, IT'S A WARNING TO ALL USERS WHICH HAVE MAYBE THE SAME ISSUE.
HANDS AWAY FROM MANUALLY INSTALLING OF CUPS ON UBUNTU!!!
I thought that my problem could only have been caused by an error in the
cups system.
Foremost I did this from comment 3:
https://askubuntu.com/questions/1286047/how-to-
1.) I Upgraded 22.04.* LTS AMD to 24.04.1 LTS AMD
All was fine - except my Printer has stopped working (this has worked before
the Upgrade!), but is installed again.
This https://ibb.co/Sfxz7nY I didn't see in this first Step
2.) After a new reboot on the next day, I saw this
https://ibb.co/Sfxz7
is a configured printer not working or are you not able to add new
printer?
could you try if system-config-printer works better?
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Title:
gnome-c
I really don't know what is happened that this problem can have cause.
I've upgraded to 24.04.1 and my previous working printer (the same then now)
has stopped working and on the next reboot I saw this like described here.
I'm not sure what this problem has cause:
- cups bug?
- missing files for
Thank you for taking the time to report this bug and helping to make Ubuntu
better. Please answer these questions:
* Is this reproducible?
* If so, what specific steps should we take to recreate this bug?
This will help us to find and resolve the problem.
** Changed in: gnome-control-ce
** Tags added: noble
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