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This problem started right after I installed a printer. Ever since, I am unable to open MCC. If I click the icon on the desktop, the authentication window opens, I type in the root password, then nothing happens. Systemd logs:

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Nov 19 01:36:37 linux.local polkitd[880]: Operator of unix-session:2 successfully authenticated as unix-user:root to gain TEMPORARY authorization for action org.mageia.drakconf.pkexec.run for unix-process:2694:4943 [/usr/bin/perl /usr/bin/drakconf] (owned by unix-user:z)
Nov 19 01:36:37 linux.local pkexec[2698]: pam_unix(polkit-1:session): session opened for user root by (uid=1000)
Nov 19 01:36:37 linux.local pkexec[2698]: z: Executing command [USER=root] [TTY=unknown] [CWD=/home/z] [COMMAND=/usr/libexec/drakconf]
Nov 19 01:36:38 linux.local drakconf[2698]: ### Program is starting ###
Nov 19 01:36:48 linux.local tracker-store[2400]: OK
Nov 19 01:36:48 linux.local systemd[2181]: tracker-store.service: Succeeded.
Nov 19 01:36:50 linux.local systemd[1]: systemd-hostnamed.service: Succeeded.
Nov 19 01:36:59 linux.local su[2921]: (to root) z on pts/0
Nov 19 01:36:59 linux.local su[2921]: pam_unix(su:session): session opened for user root by (uid=1000)


And yet, there's no MCC, just the desktop. I uninstalled the printer and CUPS, since that was the only thing I changed before this problem appeared, and it made no difference. I'm using MATE.

Can you please post the output of

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hostnamectl

This is probably the same issue as in viewtopic.php?f=7&t=13058 - please read the explanation and also the links there.
The fix is to set a proper hostname once, and that's it. If that doesn't help, please provide the output of the commands that I've asked for in the other thread, thanks in advance.

Yep, looks like that was the issue. Thanks!

Would you please mark this topic [SOLVED]?
You can do so by editing the title/subject of the first message in the topic.
Place [SOLVED] in front of subject/title.

Thanks ahead.