Public bug reported:
gdm fails to start due to Ubuntu customizations. Ubuntu has modified
the behavior of gnome-session such that ubuntu.session is the default.
When gdm launches gnome-session to start the greeter, this results in
gnome-session trying to launch unity instead of gnome-shell.
One workaround that I have proven works is to delete /usr/share/gnome-
sessions/sessions/ubuntu.session with a symlink to gnome.session. This
allows gdm to start up correctly and I can then login to a gnome-shell
session.
Another possible workaround would be to patch gdm to launch "gnome-
session --session=gnome", similarly to how
/usr/share/xsessions/gnome.desktop was patched.
srwalter@brock:~$ lsb_release -rd
Description: Ubuntu 16.10
Release: 16.10
** Affects: gdm3 (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1672064
Title:
Blank screen after switching to gdm display manager
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