*** This bug is a duplicate of bug 184 ***
https://bugs.launchpad.net/bugs/184
Confirmed, the update fixes the issue. Many thanks
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Public bug reported:
After logging in I can't screen-lock until I disable then re-enable
extensions. I have tried disable extensions one by one and it doesn't
matter which extensions are enable, any will break on first attempt to
lock after fresh login. systemd sees the SEGV, logs attached.