Please try this proposed fix (from bug 1769383):
https://launchpad.net/ubuntu/+source/gnome-shell-extension-ubuntu-dock/0.9.1ubuntu18.04.3/+build/16310198/+files/gnome-shell-extension-ubuntu-dock_0.9.1ubuntu18.04.3_all.deb
Also if "Locking and unlocking does work" then this sounds like a duplicate of bug 1800475. Do you suppose that might be accurate?
Please try this proposed fix (from bug 1769383):
https:/ /launchpad. net/ubuntu/ +source/ gnome-shell- extension- ubuntu- dock/0. 9.1ubuntu18. 04.3/+build/ 16310198/ +files/ gnome-shell- extension- ubuntu- dock_0. 9.1ubuntu18. 04.3_all. deb
Also if "Locking and unlocking does work" then this sounds like a duplicate of bug 1800475. Do you suppose that might be accurate?