On Ubuntu 11.10, I enabled the graphical login as root by (at least I think so) running
sudo passwd
After upgrading to 12.04 LTS, the graphical option has gone, while su in the Terminal is still working.
I ran sudo passwd once again, but I got no result...
Any ideas?
PS: I DO know the risks involved in enabling root, so please don't ask that.
First, check that the file /etc/lightdm/lightdm.conf is there. If it is, then do this:
sudo passwd root
sudo sh -c 'echo "greeter-show-manual-login=true" >> /etc/lightdm/lightdm.conf'
Root won't show up as a user, but "Login" will, which is how you manually log in with users not shown in the greeter.
Rebooted and then you should be able to login as root.
How can I log in as root on Ubuntu During the installation of Ubuntu 12.04 LTS you will not be asked to submit a root password. If you wish to log in as root you will first need to create a root account. You can do this by following these steps:
Login to your vps.
Use this command: sudo passwd root
Enter the password that you submitted during the installation and subsequently submit and resubmit the new password.
Use the su command to sign in as root user.
It would be better to use sudo to execute all your commands.
It may Broke your Ubuntu Installation & if that happens do Ctrl + Alt + F2 after selecting default option and then
trucate -s 0 /etc/lightdm/lightdm.conf
and then Reboot
