*** This bug is a duplicate of bug 1769383 ***
https://bugs.launchpad.net/bugs/1769383
after uninstall gnome-shell-extensions and update
gnome-shell-extension-ubuntu-dock package, the lock screen is normal now
without visible dock on locked screen.
*** This bug is a duplicate of bug 1769383 ***
https://bugs.launchpad.net/bugs/1769383
Same! Ubuntu 18.04.1 LTS Linux 4.15.0-44-generic #47-Ubuntu SMP Mon Jan 14
11:26:59 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux
The dock menu still exist when the screen has been locked.
Unstable Gnome gui
