KDE Plasma update to 5.21.5 failure

[rektal]

This morning I had an update to KDE Plasma 5.21.5 from 5.20.5.
After that I cannot log in anymore. I can enter my login and password but after that it reverse back to login screen. I type correct login and password.
I have noticed that my login screen has change its language to English. My default language is Polish.
What can I do to login to my account?

[rektal]

I have to used my Timeshift backup to login to Sparky.
I have used Konsole to update the system but after that I cannot login too.
Now I have to use my Timeshift backup again and stop updates from Sparky.
Maybe this is a problem with KDE Plasma update?

What should I do to update successfully and login to my account?
I don't know what to do. Maybe I will return to openSUSE Tumbleweed although Sparky is my favourite system now.

[rektal]

I fixed it.
I used Ctrl+Alt+F2 and Sparky tty2. After that I used command: sudo apt-get update && sudo apt-get upgrade. Then Reboot.
Now I can login again. I have got KDE Plasma 5.21.5 new features but system recognize it as Plasma Version 5.20.5.

Code Select Expand

plasmashell --version
plasmashell 5.20.5