The most common 18.10 stack trace I've seen people report is due to the transparency setting. However anything that triggers an exception in Dash to Dock when it is disabled on the lockscreen produces this issue so there are many possible causes.
https://gitlab.gnome.org/GNOME/gnome-shell/issues/237 -- You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to mutter in Ubuntu. https://bugs.launchpad.net/bugs/1799430 Title: Icon dock visible on lock screen To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-shell-extension-dashtodock/+bug/1799430/+subscriptions -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs
