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Question: I did do-release-upgrade on Ubuntu 11.10.

Now, I have Ubuntu 12.04, and I can login as a normal user, but not as root. On 11.10, I could login as root without problem.

I checked on the console, where root login works fine, and I did sudo passwd to reset the root password just in case, and I can still login on the console, but not on gnome...

Why ? Where's the problem ?

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Possible duplicate? – fossfreedom Jun 30 '12 at 18:45
I think there's a LightDM policy not to allow UIDs < 500 to login. Search AU with those keywords or google. @fossfreedom probably a dupe, but not the one you linked IMO. – izx Jun 30 '12 at 18:54
up vote 0 down vote accepted

Ah, never mind

sudo sh -c 'echo "greeter-show-manual-login=true" >> /etc/lightdm/lightdm.conf'

is not enough. Afterwards, you need to switch from gdm to lightdm

dpkg-reconfigure lightdm

and use lightdm, then reboot and use the new login option With gdm, it will still not work...

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