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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.

share|improve this question
You claim to know, and yet, here you are, asking how to do it. Check out man passwd for answers. – mikewhatever May 24 '12 at 17:22
I believe they were referring to knowing the inherent risks associated with enabling root. – reverendj1 May 24 '12 at 17:23
@reverendj1 Exactly. – jazzpi May 24 '12 at 17:25
@jazzpi Instead of writing [solved] in the post's title please use the green check mark to select the answer that you consider helped you solve your issue. – Bruno Pereira May 24 '12 at 17:49

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.

share|improve this answer
Thanks. That was it :) – jazzpi May 24 '12 at 17:30
jazzpi, Please mark the answer. – saji89 May 24 '12 at 17:31
This is not working in ubuntu patched for edubuntu. I still can't see root user while login. It just asks me password for the current user. – user112401 Dec 3 '12 at 13:11
@bob I'm not sure of what the differences are for Edubuntu. Is there no "Login" option? You would have to click that and enter root for the username. Root will not be listed on the login screen. If that doesn't work, please create a new question. – reverendj1 Dec 3 '12 at 20:04
That answer by itself breaks entire Ubuntu GUI if you didn't have file lightdm.conf previously (like I had on fresh system). You need to write more stuff to that file if it was missing, per… – Cozzamara Aug 23 '14 at 1:12

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:

  1. Login to your vps.

  2. Use this command: sudo passwd root

  3. Enter the password that you submitted during the installation and subsequently submit and resubmit the new password.

  4. Use the su command to sign in as root user.

It would be better to use sudo to execute all your commands.

share|improve this answer
FYI there is already a root account so no need to create one. You just need to activate the password for it. The process is exactly how you describe in your post. – hmayag May 4 '14 at 21:25

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

share|improve this answer
He said he didn't want to reboot if possible... – anonymous2 Jun 24 at 12:02

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