I Debian Linux
There are two methods, one is the graphical interface mode setting, the other is the command line settings:
A. Graphical interface mode:
GNOME Desktop: Open "System Main Menu", select "System > System Management > login Window", in the pop-up window, click on the "Security" option page, select "Allow local Administrator Login", click OK. Complete.
B. Command line mode: (not tested, not recommended for beginners)
# grep ‘AllowRoot‘ /etc/kde3/kdm/kdmrc
AllowRootLogin=true
# grep ‘AllowRoot‘ /etc/gdm/gdm.conf
AllowRoot=true
II Ubuntu Linux under
Here's how: (assuming GNOME desktop)
1. First unlock the root and set the password for the root user
Open terminal input: sudo passwd
Password: <---Enter your current user's password
Enter New UNIX Password: <---The new root user password
Retype new UNIX Password: <---Repeat the root user password
passwd: Password has been successfully updated
2, in the main menu of the desktop, open the system > System Management > login window, click on the "Security" tab, and select "Allow local administrator to log in". Complete....
(If you have an English interface, that is: open System--administration Login screen Setup; Click on the Security page; Select allow Root login& nbsp; )