Comment 1 for bug 1303725

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Robert Ancell (robert-ancell) wrote : Re: Greeter doesn't allow to switch sessions if only one session installed (user is set to old session)

I think the problem is:
1. You log into a standard install
2. You log out
3. You install GNOME and uninstall Unity
4. You attempt to log in

The configured session for your user is "ubuntu" but this session is no longer available. Unity Greeter doesn't show a session switcher since only one valid session is installed (GNOME).

The solution is for unity-greeter to detect that your configured session is not available and show a session switcher / or just log you into the default.