When I enter my password in the log in screen the screen goes black for a second or two, then returns me to the login screen. No matter how many times I try, I haven't been able to login. I never had this problem before.
pressing ctrl+alt+F1 works and I can login and run commands.
Searching online I found others have reported similar problems, but none of the reported solutions have worked for me. These include running clean, autoclean, and autoremove. .Xauthority is owned by me and not root.
Any ideas that may help me solve, or at least diagnose the problem?
Edit 1: I ran the command df it returned this:
Edit 2: Actions I performed days before the problem began, that might be part of the problem: I tried installing matlab and during that process my root partition "/" filled up. Then I deleted some old kernels to free up some space, keeping only the last 2.