Public bug reported:

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)

** Affects: gnome-screensaver (Ubuntu)
     Importance: Undecided
         Status: New

** Tags: amd64 apport-bug cosmic

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  Screen locking issue

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