I have tried to get Deepin to recognise my HP3630 wifi printer but keep getting the following error message: CUPS server error - 'server-err

michaelk · 03-08-2018, 11:17 AM

Code:

Listen /run/cups/cups.sock
Listen /run/cups/cups.sock

There is two listen directives but I suspect that the first should be port directive i.e. port 631. Is cups running? Look at the output of the command.

systemctl status cups

Sawsmith · 03-08-2018, 11:33 AM

Please excuse my naivety. Do I reboot after the changes?

Sawsmith · 03-08-2018, 11:34 AM

john@john-PC:~$ systemctl status cups
● cups.service - CUPS Scheduler
Loaded: loaded (/lib/systemd/system/cups.service; enabled; vendor preset: enabled)
Active: active (running) since Thu 2018-03-08 12:07:27 GMT; 5h 26min ago
Docs: man:cupsd(8)
Main PID: 474 (cupsd)
Tasks: 1 (limit: 4915)
CGroup: /system.slice/cups.service
└─474 /usr/sbin/cupsd -l

Warning: Journal has been rotated since unit was started. Log output is incomplete or u
lines 1-10/10 (END)

Mill J · 03-08-2018, 11:38 AM

Usually no need to reboot, this isn't Windows

reread my previous post https://www.linuxquestions.org/quest...9/#post5828735

Sawsmith · 03-08-2018, 11:56 AM

Still the same fault I'm afraid

Mill J · 03-08-2018, 12:08 PM

Are you able to use the webbrowser now?

I guess a person could try lpadmin run man lpadmin for more info.

ferrari · 03-08-2018, 12:09 PM

@Sawsmith:I noticed that your 'systemctl status cups' output has cupsd starting with

Code:

/usr/sbin/cupsd -l

When launched with the '-l' option, systemd socket activation is usually employed. You can check that with

Code:

systemctl status cups.socket

It also explains why /etc/cups/cupsd.conf only had the 'Listen /run/cups/cups.sock' directive.

This means cupsd is only launched when required (on demand with a pending print job for example). It also means cupsd stops again after a period of inactivity. There nothing wrong with that (for most users), but that is why you couldn't reach the CUPS web interface via a browser. I have found it problematic when configuring network printers though as cupsd (CUPS server daemon) isn't running when needed for configuration. However, socket activation can be disabled if required, and /lib/systemd/system/cups.service can be adjusted to start with 'cupsd -f' instead. (Usually best accomplished by creating a custom unit file in/etc/systemd/system/ directory.)

Sawsmith · 03-08-2018, 12:28 PM

To answer you both:

Mill J - I am reading this in my web browser, so yes. I have tried to run your lpadmin script, but it doesn't like the 'run' command.

john@john-PC:~$ lpadmin run man lpadmin
lpadmin: Unknown argument "run".

Ferrari - Here is what was produced from your 'systemctl status cups.socket' command:

john@john-PC:~$ systemctl status cups.socket
● cups.socket - CUPS Scheduler
Loaded: loaded (/lib/systemd/system/cups.socket; enabled; vendor preset: enabled)
Active: active (running) since Thu 2018-03-08 12:07:27 GMT; 6h ago
Listen: /run/cups/cups.sock (Stream)

Warning: Journal has been rotated since unit was started. Log output is incomplete or u
lines 1-6/6 (END

ferrari · 03-08-2018, 01:11 PM

Ok, that confirms socket activation is in use. As I said, there is nothing wrong with that, but it means cupsd is not permanently running from boot. IIRC, the act of running

Code:

lpinfo -v

can trigger it, and cupsd will stay active for 30 seconds or so. You can confirm that with

Code:

ps -aux|grep cupsd

While cupsd is active you can prceed with configuration, either with a printer configuration utility (I'm not familar with deepin), or via a browser pointed at 'localhost:631' as already mentioned.

Sawsmith · 03-08-2018, 01:25 PM

Neither works I'm afraid.

I've instigated that command several times and tried both configuring the printer and typing localhost:631 into my browser. Both created the same error message as at start.

ferrari · 03-08-2018, 02:16 PM

I don't know what you mean by "neither works". I assume that the 'ps' command did not show cupsd active? Try restarting with

Code:

sudo systemctl restart cups

and then see if you can reach the web interface via a browser. Alternatively, what printer configuration utility does deepin provide (usually under a system menu)?

Sawsmith · 03-08-2018, 02:45 PM

What I mean by neither works is that typing localhost:631 into my browser and/or configuring my printer using the printer control panel, doesn't work.

I've already tried 'sudo systemctl restart cups' as well. No go.

I have wasted an entire day trying to get this printer working as a lot of effort went into it before I got to this forum. I've even contacted Deepin technical themselves (no answer as yet).

Many thanks Ferrari and Mill J, for all of your efforts, but I think I'll go back to Mint.

ferrari · 03-08-2018, 03:02 PM

Quote:

Many thanks Ferrari and Mill J, for all of your efforts, but I think I'll go back to Mint.

Well, that's one option.

If you want to disable socket activation, you can do the following

Code:

sudo systemctl stop cups.socket

Code:

sudo systemctl stop cups.path

Code:

sudo systemctl disable cups.socket

Code:

sudo systemctl disable cups.path

Create a custom cups.service in /etc/systemd/system/ directory (to override the cups package cups.service)

Code:

sudo nano /etc/systemd/system/cups.service

and add

Code:

[Unit]
Description=CUPS Scheduler
Documentation=man:cupsd(8)

[Service]
ExecStart=/usr/sbin/cupsd -f
Type=simple

[Install]
WantedBy=printer.target

Save when done, then

Code:

sudo systemctl daemon-reload

Code:

sudo systemctl enable cups

Code:

sudo systemctl start cups

Now cupsd will be started each and every boot (rather than on demand).

FWIW, here's a recent Ubuntu bug report dealing with socket activation issues...
https://bugs.launchpad.net/ubuntu/+s...s/+bug/1598300

ferrari · 03-08-2018, 03:06 PM

BTW, you would also need to add the directives (added to cupsd.conf) mentioned by Mill J back in post #12.

Sawsmith · 03-09-2018, 02:42 AM

Thanks again Ferrari.

I will try this on my other machine, but for now and to keep me up and running, Mint is the way forward and it's already working.