This looks like it:
Nov 07 20:13:10 hostname gnome-session-binary[7876]: WARNING:
Application 'org.gnome.Shell.desktop' killed by signal 11
...
Thank you for taking the time to report this bug and helping to make
Ubuntu better. However, your crash report is either missing or
challenging to deal with as a ".crash" file. Please follow these
instructions to have apport report a new bug about your crash that can
be dealt with by the automatic retracer.
If you are running the Ubuntu Stable Release you might need to enable
apport in /etc/default/apport and restart.
Now open your file manager, navigate to your /var/crash directory and open the
crash report you wish to submit.
If this fails you will have to open a terminal and file your report with
'ubuntu-bug /var/crash/_my_crash_report.crash' where _my_crash_report.crash is
the crash you would like to report. If you get an error that you aren't allowed
to access this report you will have to file it with 'sudo ubuntu-bug
/var/crash/_my_crash_report.crash'.
After the new bug report with a crash file has been created, please
comment here telling us the new bug ID. Please do not manually attach
any crash files to bugs - only use ubuntu-bug (or apport-cli).
** Changed in: gnome-shell (Ubuntu)
Status: New => Incomplete
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Desktop Bugs, which is subscribed to gnome-shell in Ubuntu.
https://bugs.launchpad.net/bugs/1730748
Title:
gnome-shell froze and crashed
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