*** This bug is a duplicate of bug 1769383 ***
https://bugs.launchpad.net/bugs/1769383
Thanks for the details, but if I see correctly this was handled in the dock
extension, meaning the lock does not forcibly locks all apps, but dock now
"respects" the lock request.
This means this or similar
*** This bug is a duplicate of bug 1769383 ***
https://bugs.launchpad.net/bugs/1769383
** This bug has been marked a duplicate of bug 1769383
Ubuntu dock/launcher is shown on the lock screen
** Information type changed from Private Security to Public Security
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