Public bug reported:

Ubuntu Release: Ubuntu 18.04.3 LTS
Lightdm Version: 1.26.0-0ubuntu1

In some programs I can't get out of fullscreen.

I'm using Ubuntu 18.04 Bionic Beaver with Unity. I installed Unity because I 
simply don't like GNOME. The problem is that some programs get stucked in 
fullscreen, freezing the screen, not getting any response of any kind. The 
mouse moves, but that's it. Killing the process does not resolve the issue.
This problem came with Ubuntu 18.04 or Unity since the release of Bionic 
Beaver. At this point I'm used to it. I get rid of it by going to terminal with 
ctrl+alt+f4 and typing "sudo service lightdm restart" or by rebooting with 
"sudo reboot now". But It's kind of a nuisance having to do this everytime. The 
programs that get stucked are Stellarium, Whatsdesk, SMPlayer and some flash 
players in firefox. Everyday I upgrade Ubuntu and Lightdm hoping this to be 
solved, but nothing happens.
Weird thing: When I restart lightdm the problem dissapears until I sleep or 
reboot my notebook.

Attached here is the "cat /var/log/syslog" output when the problem is
ocurring using Whatdesk (at 19:53:01 I restart lightdm).

** Affects: lightdm (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: 18.04 fullscreen lightdm org.gnome.sessionmanager stuck unity

** Attachment added: "/var/log/syslog when it's happening."
   
https://bugs.launchpad.net/bugs/1853786/+attachment/5307584/+files/LightDM%20Bug%20Report%20To%20Launchpad

** Package changed: xorg (Ubuntu) => lightdm (Ubuntu)

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https://bugs.launchpad.net/bugs/1853786

Title:
  Fullscreen stuck in various applications. Ubuntu 18.04 with Unity.

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