adding printer, Authentication adding printer username password

Question

I am adding the printer from the windows network via samba.

All seems fine: - I can authenticate the access to the domain, - I can see all the printers there. - Adding ppa file, which I download from the printer manufacturer website

But I stuck in the last point when I click apply button and see another authentication window which asks just Username and Password (without domain).

I tried everything and nothing works:

1. Adjust smbd config to have by default the domain name, which I need
2. {user}@{domain}
3. {user}/{domain}
4. {domain}/{user}
5. {user}

Access to cups server works on localhost:631.

Solution 1

OK, I figure out, that this is the request of a CUPS server authentication, which by default, has a value basic in config. And you have to switch it off by doing the following:

1. sudo nano /etc/cups/cupsd.conf
2. change the value DefaultAuthType to None
3. sudo service cups restart

No authentication required anymore

Solution 2

In Ubuntu 19.10 a new problem arises with the previous solution stated, where there is no longer a password being requested but the window freezes.

After digging around I found this solution: https://unix.stackexchange.com/a/513983/386631

Taking from the answer:

1. Open the file /etc/cups/cups-files.conf.
2. Find the group name at the line containing SystemGroup (in Ubuntu it should be lpadmin).
3. Add yourself to that group (sudo usermod -a -G lpadmin your-username)
4. Apply it (sudo service cups restart).

There will still be an authentication dialog, but now if you put your PC's username and password it works.

Comments

[0x539]

3. should read sudo service cups restart... no s at the end of service

[Juan Matias Granda]

Good suggestion 0x539. I edited the answer.

[poomerang]

Even after following these steps and restarting the system, I keep receiving an authentication error when trying to print (a test page). Any suggestions?

[zhukovgreen]

@poomerang hello. This answer resolves the authentication dialog problem.

[poomerang]

as I said, not for me: the print job is "Held for authentication" anyway and there is no combination of user+password that works

[oᴉɹǝɥɔ]

This also works in 20.04. Authentication dialog no longer pops up after signing out of desktop environment and signing back in.

[robomc]

Note that for me, on 20.04, this was the solution but the accepted answer also caused no harm. i.e. I didn't need to change the DefaultAuthValue back for it to work.

[Xzu]

Don't work for me with 20.04, and I'm in the lpadmin group, still ask login and password.

[Ilya Bystrov]

I don't think that removing auth check is a good approach.

[Wirone]

Adding user to lpadmin did the trick on Ubuntu 20.10, thanks!

[Mark]

Its almost like you need a advanced degree to add a printer.