I also saw a gdm greeter spawned during an upgrade, and I can reproduce this with `sudo dpkg-reconfigure gdm`. It is not unresponsive for me, though; I can log in as myself to return to my session.
I also saw a gdm greeter spawned during an upgrade, and I can reproduce this with `sudo dpkg-reconfigure gdm`. It is not unresponsive for me, though; I can log in as myself to return to my session.