I'm getting a "The panel encountered a problem while loading "OAFIID:GNOME_FastUserSwitchApplet"." when logging in. There are numerous threads with this, but I can't find one marked solved or with a working solution. The two solutions I have not tried are installing the fast-user-switch-applet (because that package has been retired, apparently replaced by gdm which is installed) and installing ubuntu-desktop (because this is a flash drive installation and I don't have the space).
It would be fantastic if people might give a little more advice.