Ubuntu asking for password again and again I am also having the same problem . When I enter my password while booting up, it shows screen with system loadings for a split second and takes me back to password entry screen
When the password entry screen appears on the display manager screen
press Ctrl + Alt + F1
. After that, you will get to the console. There enter
login and then password.
sudo chmod -R u+w /home/user
cd /home/user
sudo rm -f .Xauthority .ICEauthority
go through live USB, when you start clicked to restore the system - it also helps