It looks like nouveau is gpu hanging on boot for some reason.
When you're setting nomodeset, it's disabling nouveau entirely so you're
booting with vesa, which won't give the best graphics. Anyway, that's
why it works in that case.
** Changed in: xserver-xorg-video-nouveau (Ubuntu)
Importance: Undecided => Medium
** Changed in: xserver-xorg-video-nouveau (Ubuntu)
Status: Confirmed => Triaged
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https://bugs.launchpad.net/bugs/1098316
Title:
Ubuntu crashes on graphical login
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