for those who are affected by this bug, here's a workaround:
$ cd /usr/share/gnome-session/sessions $ sudo mv ubuntu.session ubuntu.session.dontuse $ sudo mv gnome.session ubuntu.session
restart lightdm and now you will always drop into gnome-shell.
for those who are affected by this bug, here's a workaround:
$ cd /usr/share/ gnome-session/ sessions session. dontuse
$ sudo mv ubuntu.session ubuntu.
$ sudo mv gnome.session ubuntu.session
restart lightdm and now you will always drop into gnome-shell.