fedora15 root用户登录方法1.su -
2.gedit /etc/pam.d/gdm 打开后用#注释掉 auth       required    pam_succeed_if.so user != root quiet
3.gedit /etc/pam.d/gdm-password 打开后用#注释掉 auth required pam_succeed_if.so user != root quiet
4.注销当前用户，然后用root用户登录