Frozen login after update

I am new to linux and plasma. After automatic update, login screen in image says, the current theme cannot be loded. Mouse cursor works, but I cant click anything. What to do?

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Ok, a shot in the dark… I see something similar on FreeBSD with sddm (v0.21.0) set up for Plasma5 but using a boot environment with Plasma6 (I’m able to select users and enter passwords tho. Autologin also works)

Which OS and Distribution?

The OS was preinstalled, that’s why i don’t know much about it. I tried out every option in ‘grub’ and took images.

Can I do/type something in grub terminal or do I have do clean install. But what version?

And this is another image. I cant post more than one for now.

Looks like KDE Neon Linux (4th Post Grub entries) and a broken/half finished upgrade (3rd Screen)

Any Timeshift backup you can roll back to?