Can't login after update to 6.3 (Neon)

[AllanJ]

Been using Neon with Plasma 6.2 and finally gave in to the upgrade notices today. Oops. I used the software center, as that popped up in the notifications, so I clicked okay and then it went through the upgrade / reboot process.

The login screen looked like this:

Note that the session list is empty - clicking on it does nothing. This is a desktop, so I’ve no idea why the OSB is there. Trying to type in the password, or using the OSB does nothing.

I found this thread so I switched to a virtual terminal and when through that process. Now not even the login manager will load!

Any suggestions on how I can get Plasma back up and running?

Thanks!

[tbonaccio]

Check this post, it may help you:

I'm blocked at the kde log in screen (which doesn't have its usual appearance), after I updated my KDE Neon

Yesterday, I updated KDE neon normally with Discover. But after restarting my computer, I’m blocked on this login screen (and the appearance of the log in screen has changed, because I’ve never had a login screen with this appearance before) [IMG_20240304_181509] . https://imgur.com/a/ZekiZs2 And when I type my password, the screen goes black for a second, then redisplays the login screen. And if I retype my password, the same thing will happen again. So I can’t log in. I have tried differ…

[dediananto]

I get the same issue. after running pkcon update, I can not login. the issue is something about qt6. it is different from previous reported

[aguzinski]

The post linked above links to https://askubuntu.com/questions/1506052/how-to-fix-kde-neon-user-edition-errors-and-update-to-plasma-6
Did you already try those steps from a virtual terminal (press ctrl+alt+f4)?

If this does not work, please post the full error message about qt6.

[AllanJ]

Sorry it took me so long to reply. That post did help - got my system back up and running. SDDM isn’t working, but I guess that is a different issue. I can at least get into Plasma now :-).

Thanks for your help!

[HP_Fedora]

in the settings, enter SDDM in the search and there you need to APPLY Plasma settings in the window header at the top right (not at the bottom)

[HP_Fedora]

By the way, if you enabled NUMLOCK on your keyboard in the Settings when logging in, then you also need to apply the Plasma settings in the SDDM section (there is a list that takes into account the NUMLOCK status), and when you enter the password screen, you can use the numeric keypad without pressing NUMLOCK.