Start with these steps.
1. open a terminal with Ctrl+Alt+T and run these commands:
Code:
sudo apt update
sudo apt upgrade
if there are errors, post the output here for analysis
2. if there are no errors, then do this:
Code:
sudo passwd -S <username>
Replace username with your actual username. This will check if your account is somehow locked or disabled. If it returns L or NP then you can unlock it with this command:
Code:
sudo passwd -u <username>
Let's first see if any of this helps before considering next steps.
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