gnome shell crashes after disconnecting external monitors

- happens when windows are open on external monitor before unplugging it
- happens when dock is enabled (seems not to happen when dock is disabled)

Please uninstall the extension '<email address hidden>' and log in again. If the crash still happens then...

Thank you for taking the time to report this bug and helping to make Ubuntu better. It sounds like some part of the system has crashed. To help us find the cause of the crash please follow these steps:

1. Look in /var/crash for crash files and if found run:
    ubuntu-bug YOURFILE.crash
Then tell us the ID of the newly-created bug.

2. If step 1 failed then look at https://errors.ubuntu.com/user/ID where ID is the content of file /var/lib/whoopsie/whoopsie-id on the machine. Do you find any links to recent problems on that page? If so then please send the links to us.

3. If step 2 also failed then apply the workaround from bug 994921, reboot, reproduce the crash, and retry step 1.

Please take care to avoid attaching .crash files to bugs as we are unable to process them as file attachments. It would also be a security risk for yourself.

This one seems not to happen any more after removing the said extensions (system-monitor-next...) but I also disabled dash and icon desktop.

I am still experiencing another issue related to monitors but it is probably separate so will follow in another report.

Please check to see if the problem still occurs when the standard Ubuntu extensions are enabled.

So far so good, will keep an eye and report back in case I experience a bad crash again.

I do sometimes get logged out after messing with monitors still but after log in all applications are still there. Don't know if this is expected, I'd say not, but as the work is not lost it does not seem "critical".

Just happened again. Disconnecting external monitors lead to crash in which after log in the session was lost. I do not see a related crash in /var/crash/... nor anything at https://errors.ubuntu.com/user/ID

If you have any unexplained crash that doesn't leave a crash file then please:

1. When the crash occurs, wait 10 seconds and then reboot.

2. Run:

   journalctl -b-1 > prevboot.txt

3. Attach the resulting text file here.

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