Huge update - can't log in

I update my KDE neon system frequently, but I’ve just had a huge update, over 3GB to my KDE neon. The system rebooted and offers the login screen. I enter the correct password, the screen goes black (which is normal) thinks for a second and then returns to the login screen.
I’ve rebooted multiple times and the issue persists, what can I do?

Check this thread, maybe this is also your issue?

thank you so much @Duha for your incredibly quick response

  • unfortunately it didn’t work for me.
    The two commands that did work were:
    sudo apt autoremove
    removed a huge number of packages.

sudo pkcon install plasma-desktop-data
ran succesfully but (annoyingly) did not resolve the issue

I’ll put this in the other thread.