I was trying to use Ubuntu 12.4 with administrative privileges. So I typed the following commands in bash shell.
sudo -v
sudo su -
startx -- :2 vt8
I don't know what I have done. Now, I can login as a guest only at boot up.
When I try to login as a user, the login page refreshes and come back to the same page. When I log in as a guest, it won't allow me to access any of the user's file. I get this message:
you don't have the authority to access this folder.
>It's not allowing to access any of the user's file.
How can I solve this problem?