This seems like a duplicate of #1716982, but maybe it's a regression
after that was fixed. Anyway, commenter ernstp identifies the cause in
comment #12 [1]:
> Is it some global variable name conflict between the two extensions?
"dockManager" perhaps?
You can edit /usr/share/gnome-shell/extensions/ubuntu-
d...@ubuntu.com/extension.js to check for a null dockManager in the
disable() function. That is, change
dockManager.destroy()
to
if (dockManager != null) {
dockManager.destroy();
}
and the dock disappears when the screen is locked, as expected.
I'm guessing the problem is that Dash To Dock sets dockManager to null
after calling destroy(), and then Ubuntu Dock throws a TypeError when it
tries to do the same, so Ubuntu Dock never reaches the
ExtensionSystem.disconnect() call.
[1] https://bugs.launchpad.net/ubuntu/+source/gnome-shell-extension-
ubuntu-dock/+bug/1716982/comments/12
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https://bugs.launchpad.net/bugs/1769383
Title:
Ubuntu dock/launcher is shown on the lock screen
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