Today I booted up Ubuntu and the login screen was back to the default for some reason and every time I tried to log in it would show a black screen and return me back to the login screen. I have tried the suggestions from ubuntu does no let me log in to my user, how can I fix it? and that didn't help.
I did find that when I tried to update I got this error:
W: GPG error: HTTP://cdn.dyn.com/dynupdater/debian stable/ Release: The
following signatures were invalid: EXPKEYSIG C0943F422A34BCA6 Dyn Package
Signing Key
I also get an error that that repository is not signed. From there I tried the suggestions here: https://askubuntu.com/questions/131601/gpg-error-release-the-following-signatures-were-invalid-badsig
Importing the key still says that it is expired. I'm not familiar with keys and this sort of thing so any help would be appreciated.
