Can this perhaps have to do with this bug in Fedora 30: https://bugzilla.redhat.com/show_bug.cgi?id=1706090 ?
See also bug 1853242. ** Bug watch added: Red Hat Bugzilla #1706090 https://bugzilla.redhat.com/show_bug.cgi?id=1706090 -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to cups in Ubuntu. https://bugs.launchpad.net/bugs/1849859 Title: error when connecting to smb server Status in cups package in Ubuntu: Confirmed Status in samba package in Ubuntu: Confirmed Status in system-config-printer package in Ubuntu: Confirmed Bug description: when I connect to smb server (nas) permanently appears "Error while getting peer-to-peer dbus connection: Operation was cancelled" The printer at this NAS doesn't work too. "held for authentication KeyError: 'auth-info-required'" The same printer at usb port works fine. Ubuntu development version 20.04 system-config-printer version 1.5.11-4ubuntu1 smbclient version 2:4.10.7+dfsg-0ubuntu3 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/cups/+bug/1849859/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : email@example.com Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp