1. The 'pixel-saver' extension may be causing some bugs so maybe remove it while debugging.
2. You haven't actually had a gdm3 boot attempt since 9 December. So the failures you are experiencing recently are from SLiM, which makes this bug invalid for gdm3.
I recommend reinstalling Ubuntu and if a problem occurs with a clean installation then run:
There are two main issues I can see:
1. The 'pixel-saver' extension may be causing some bugs so maybe remove it while debugging.
2. You haven't actually had a gdm3 boot attempt since 9 December. So the failures you are experiencing recently are from SLiM, which makes this bug invalid for gdm3.
I recommend reinstalling Ubuntu and if a problem occurs with a clean installation then run:
ubuntu-bug gdm3
to create a new bug.