This is starting to sound like a kernel problem.
Are you able to log in to a VT? Instead of logging in normally try
pressing Ctrl+Alt+F4 and then log into the text console.
If that worked then run:
dmesg > dmesg.txt
and attach the resulting dmesg.txt to this bug.
** Changed in: gnome-shell (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1792807
Title:
Login screen freeze
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