Trouble applying theme to login screen

Help
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1

I am new to Linux, and am using Fedora 44 Plasma 6.7.1

I wanted to change the theme of my login screen to match the rest of my desktop (mainly due to the recent Air/Oxygen overhaul), but I’m having a certain issue.

I try to change it via clicking ‘Apply Plasma Theme’ through System Settings → Security & Privacy → Login Screen, but the authenticator freezes up after I enter my password, and subsequently returns with the error message “DBus Backend error: could not contact the helper. Connection error: Did not receive a reply. Possible causes include: the remote application did not send a reply, the message bus security policy blocked the reply, the reply timeout expired, or the network connection was broken.. Message error:”

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authenticator freezing

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what happens after authentication freezes

What should I do in order to fix this issue?

2

Does your journalctl have something suspicious around the time you’re clicking OK?

I have had trouble with Plasma Login Manager not applying the theme correctly on some machines (esp. ones which had SDDM before and/or beta versions of PLM installed previously) and what helped is deleting the plasmalogin’s home directory, reinstalling plasma-login-manager and rebooting before trying to apply the theme again.

Something like this:

$ cat /etc/passwd | grep plasmalogin
plasmalogin:x:950:950:PLASMALOGIN Greeter Account:/var/lib/plasmalogin:/usr/bin/nologin

For me, the home folder is /var/lib/plasmalogin/. I removed that folder. This home folder should be recreated when the package is installed again, e.g. (for Arch):

$ pacman -S --asdeps plasma-login-manager

Then reboot and then try applying the theme again, reboot again.