Lock screen does not appear when screen locks

[Talib Pierson]

When I close the laptop lid, the screen locks, but when I start it up again, instead of prompting me to enter my password at the lock screen, I appear to be back in, even though I am not. The glitched session seems in between a vanilla gnome session and my Ubuntu session. I can try to open applications with the Ubuntu dock, but they will not open. The top bar doesn't have a log out or settings, more like vanilla gnome in Debian. Sometimes white pixels will appear at the top edge of the screen near this area. Sometimes the lock screen will appear, but not as usual. The Ubuntu dock appears even though I haven't entered my passcode yet. I should send screenshots. I wasn't always able to take successful screenshots, but I have some. I don't believe this to be much of a security issue, because I don't appear to be able to open any applications, although it does show what files I have on my desktop. I am using a system76 laptop.
Description: Ubuntu 18.10
Release: 18.10
ubuntu-session:
  Installed: 3.30.0-0ubuntu4
  Candidate: 3.30.0-0ubuntu4
  Version table:
 *** 3.30.0-0ubuntu4 500
        500 http://archive.ubuntu.com/ubuntu cosmic/main amd64 Packages
        500 http://archive.ubuntu.com/ubuntu cosmic/main i386 Packages
        100 /var/lib/dpkg/status
gnome-screensaver:
  Installed: 3.6.1-8ubuntu3
  Candidate: 3.6.1-8ubuntu3
  Version table:
 *** 3.6.1-8ubuntu3 500
        500 http://archive.ubuntu.com/ubuntu cosmic/universe amd64 Packages
        100 /var/lib/dpkg/status
I expected a lock screen to prompt me to enter my password. Instead, it was either missing, or it displayed along with the Ubuntu dock, which shouldn't display on top of the lock screen. I also appeared to be using a modified gnome session, even though ubuntu-session, but not gnome-session, is installed. I've reinstalled ubuntu-session and ubuntu-desktop already. I know for sure this is within the scope of ubuntu-desktop, because when I installed Kubuntu it stopped happening. When I uninstalled kubuntu and reinstalled Ubuntu, it started happening again. I've uninstalled some default packages, but noting ubuntu-session depends on, so I'm not sure what the problem is. gnome-power-manager is not installed, but I don't think it needs to be. It reminds me of the issues linked below:
https://bugzilla.redhat.com/show_bug.cgi?id=713640
https://wiki.ubuntu.com/DebuggingScreenLocking/HowScreenLockingWorks#GNOME_Power_Manager
https://askubuntu.com/questions/453296/privacy-issue-when-waking-up-suspended-machine
Except logging in does not seem to work properly, and will log me into what seems to be a gnome session, with all the application icons changed, and all that.

ProblemType: Bug
DistroRelease: Ubuntu 18.10
Package: ubuntu-session 3.30.0-0ubuntu4
ProcVersionSignature: Ubuntu 4.18.0-11.12-generic 4.18.12
Uname: Linux 4.18.0-11-generic x86_64
ApportVersion: 2.20.10-0ubuntu13.1
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Thu Nov 22 10:01:17 2018
InstallationDate: Installed on 2016-08-16 (827 days ago)
InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
PackageArchitecture: all
SourcePackage: gnome-session
UpgradeStatus: Upgraded to cosmic on 2018-10-21 (31 days ago)

[Talib Pierson (a010060)]

Oh, and the screen sometimes turns black as the background when I move my cursor

[Daniel van Vugt (vanvugt)]

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. Feel free to continue to report any other bugs you may find.

[Daniel van Vugt (vanvugt)]

It sounds like you might have multiple bugs, but for the moment let's wait till bug 1769383 is fixed and then retest.

[Talib Pierson (a010060)]

You instructed me to make any further comments on the other report, but I think that it is possible that bug 1804718 is not a duplicate because I cannot open the applications; it only plays the animation. I may be wrong, but I'll post more screenshots so you can see. It's possible my memory is a little off, because a lot of other unrelated issues have occurred so I think the images are most accurate.

[Talib Pierson (a010060)]

The bug reoccurred just now. The bar behavior did not occur, but the weird black screen thing did, and I coudn't interact with any of my windows that appeared to be open.