I decided to leave my laptop and came back a few minutes later, and I noticed that the dash was visible from the lockscreen. Not good. Running Ubuntu 18.10 as a fresh install. Was able to quit and open applications from the dash. Uncertain if that's a security risk or not. Uncertain of how to reproduce as in what triggered it. Dash should definitely not be visible when the lockscreen is active.
ProblemType: Bug
DistroRelease: Ubuntu 18.10
Package: gdm3 3.30.1-1ubuntu5
ProcVersionSignature: Ubuntu 4.18.0-10.11-generic 4.18.12
Uname: Linux 4.18.0-10-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.10-0ubuntu13.1
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Mon Nov 12 15:41:14 2018
InstallationDate: Installed on 2018-11-11 (0 days ago)
InstallationMedia: Ubuntu 18.10 "Cosmic Cuttlefish" - Release amd64 (20181017.3)
ProcEnviron:
TERM=xterm-256color
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=en_US.UTF-8
SHELL=/bin/bash
SourcePackage: gdm3
UpgradeStatus: No upgrade log present (probably fresh install)
Thank you for taking the time to report this bug and helping to make Ubuntu better. This particular bug has already been reported and is a duplicate of bug 1769383, so it is being marked as such. Please look at the other bug report to see if there is any missing information that you can provide, or to see if there is a workaround for the bug. Additionally, any further discussion regarding the bug should occur in the other report. Please continue to report any other bugs you may find.