OK. Please provide some/all of the information requested in comment #2.
I suggest the next steps are:
1. Apply the workaround from bug 994921 first.
2. Then next time the problem happens look in /var/crash for relevant
crash files and if found then run: ubuntu-bug
/var/crash/YOURFILE.crash
3. If there were no crash files then please run 'kill -ABRT <PID>' on
the hung gnome-shell process. Then goto step 2.
4. Tell us here the IDs of any new bugs opened via 'ubuntu-bug'.
5. After the problem happens next time, please run these commands and send us
the resulting files:
dmesg > dmesg.txt
journalctl -b > journal.txt
** Changed in: gnome-shell (Ubuntu)
Status: Confirmed => Incomplete
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https://bugs.launchpad.net/bugs/1730540
Title:
gnome-shell freezes after resume then unlock
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