Your attach logs also show a segfault:
jan 17 07:12:01 hostname gnome-session-binary[1308]: WARNING:
Application 'org.gnome.Shell.desktop' killed by signal 11
However to work on this bug we will need to know at least the stack
trace of the crash. Please look in /var/crash for relevant crash files
and then:
1. Change this bug from Public to Private(!)
2. Attach the crash file(s) from gnome-shell here.
** Changed in: gnome-shell (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1743732
Title:
Gnome shell crashes at lock screen
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