title: Could not login in Ubuntu 20.04 LTS
body: <p>I have just upgraded my operating system Ubuntu 18.04 LTS to Ubuntu 20.04 LTS. But after installing completely, during login I couldn't login even with right password.I checked it was indeed a right password by entering username and password after pressing <kbd>Ctrl</kbd> + <kbd>Alt</kbd> + <kbd>F2</kbd>, I even changed the password from advanced recovery mode but still new password also doesn't work. For the right password the screen goes black for like a second then again comes back in the same purple login screen but with wrong password it says -sorry, that didn't work. please try again. I am new to Linux and any help is appreciated. </p>