Cannot set CUPS username in Kubuntu 20.04

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I need to set a specific username for printing (network printer at work).

In Kubuntu 16.04, I used to be able to set it using the CUPS interface at http://localhost:631 (via Administration, Manage Printers, Set Default Options, Job Log, UserId). However, in Kubuntu 20.04, it is not working.

I tried to set User myname in /etc/cups/cups-files.conf, but when I do that and do sudo service cups restart, CUPS fails and the printer dialog says "Print service is unavailable. Bad file descriptor". Should it not be possible to set the User variable in that file?

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