1. Login as root from terminal
$ su – root
2. change dir
# cd /etc/pam.d
3. edit gdm
# vi gdm
auth required pam_succeed_if.so user != root quiet <------- comment
4. make backup of gdm-password
# cp gdm-password gdm-password.bkp
5. edit gdm-password
# vi gdm-password
auth required pam_succeed_if.so user != root quiet <------- comment
6. logoff and login
$ su – root
2. change dir
# cd /etc/pam.d
3. edit gdm
# vi gdm
auth required pam_succeed_if.so user != root quiet <------- comment
4. make backup of gdm-password
# cp gdm-password gdm-password.bkp
5. edit gdm-password
# vi gdm-password
auth required pam_succeed_if.so user != root quiet <------- comment
6. logoff and login