Screen locking issue

[Kevin Arnett]

Upgraded to Cosmic Cuttlefish a little over a week ago, Now every time that the computer locks the screen, the screen is mostly blank and shows only the launchpad with favorites at the left, and the status icons at the top right. Clicking on the apps shows the app for a moment before being hidden again.
  The system drop down menu shows the usual information except the system tools / lock / power icons with a pause button displayed in their place but all is disabled except the pause button which suspends the computer.
  Upon waking again the computer is still locked. Have not discovered a key sequence that does anything when in this state. Cannot even switch virtual terminals or desktops.
  My only solution has been to power off the machine and do a hard reboot.

I expected the lock screen to blank out the screen as it did in the previous release and show a login
My computer is a Lenovo Thinkpad T-410 with 6Gb RAM.

ProblemType: Bug
DistroRelease: Ubuntu 18.10
Package: gnome-screensaver (not installed)
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: Fri Dec 7 03:01:50 2018
EcryptfsInUse: Yes
InstallationDate: Installed on 2017-03-22 (624 days ago)
InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
SourcePackage: gnome-screensaver
Symptom: security
Title: Screen locking issue
UpgradeStatus: Upgraded to cosmic on 2018-11-26 (10 days ago)

[Kevin Arnett (heavykevy)]

I would like to add that the bug occurs after swiping the notification screen up.
The blank screen that usually shows with the password entry box shows but without anything on it and the applications bar on the left is still showing.

After applying the most recent update the bug seems to be happening less often, and only when the screen locks after not being used until it timed out.
I work remotely and use Remina, skype, slack and Chrome which are usually all open when the issue occurs.

[Kevin Arnett (heavykevy)]

I am attaching an image of the error.

[Kevin Arnett (heavykevy)]

I discovered that the issue seems to not actually be the lock screen.
Last night the screen timed out but did not lock as the lock is set to happen at 30 minutes but the blank screen at 10 min.
The screen blanked and the issue occurred. I came back to the laptop some time later and found that the login prompt was there, and it let me enter my password and login.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Helio Neto (remiariro)]

Related and possible duplicates: #1809536, #1800475, #1799293

[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.