I haven't found out how to set XDG_CURRENT_DESKTOP from mdm (Linux Mint's fork of older gdm), so then when attempting to login to Gnome- Shell I am greeted with a black screen. However, doing this is a workaround (but still leaves XDG_CURRENT_DESTKOP unset):
in /usr/share/upstart/sessions/gnome-session.conf change: instance $XDG_CURRENT_DESKTOP to: instance GNOME -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1293629 Title: [Regression] [Trusty] Unity can't be started from kdm To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-session/+bug/1293629/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
