Some time back I installed ubuntu-gnome-desktop in Ubuntu 16.04 (possibly 14.04, since upgraded?) and it used to work fine. Now if I choose that session at the lightdm greeter I get a desktop which I think is actually Unity (XDG_CURRENT_DESKTOP=unity), although there is no launcher or top panel and windows don’t have widgets. If I run gnome-shell --replace in a terminal the Unity launcher and top panel appear. I’ve tried purging the package and reinstalling it, but nothing changes (in fact very little seems to be removed or reinstalled).
/usr/share/xsessions contains a gnome.desktop with Exec=gnome-session --session=gnome which sounds right.
Edit: I tried removing most/all of the contents ~/.config/autostart and then gnome-shell --replace does start gnome. Still don’t understand why the session starts Unity though. XDG_CURRENT_DESKTOP still says unity.
As a fresh install, 16.04 has been OK, but as an upgrade it seems very, very buggy.
Edit 2: After installing budgie-desktop from the budgie-remix PPA I get the same result. I guess the common denominator is Gnome.
Edit 3: Guest logins show the same behaviour—Unity, xfce and fluxbox work fine; Gnome and budgie don’t. This seems to rule out another commonly offered solution: deleting ~/.config or ~/.cache.
What is going on here?
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