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I installed Ubuntu-minimal and tried to install gnome 3 to see how it was. It seems to have installed ok and I've got to the gdm screen. However, there are no users listed, it just says "Other", and when I click that to try and login using my username and password it just greys out like it's trying to login but doesn't do anything (no hdd activity). Yet when I try a username that doesn't exist it says "Authentication failed"

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up vote 6 down vote accepted

I think you should install accountsservice :

sudo apt-get install accountsservice

It solved the problem for me :-)

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Log into a Recovery console from Grub, drop to a root shell with Internet and install

sudo apt-get update; sudo apt-get install gnome3-session

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