When I try to login to my administrative account using Ubuntu's login screen, I cannot. However, I can access other accounts and log in to them. Additionally, I can login to my account using
su command in one of the standard accounts by Terminal.
For instance, I've logged in to someone's account and I'm questioning from there. Now, I can open Terminal, run
su machitgarha, enter the right password and login to my account. However, with that true password, there is no chance for logging in to my account using login screen.
Could someone help me please? Any ideas?