Same thing has happened to me.
Ubuntu 19.10 upgrade with all updates installed.
Game shows  black screen with mouse control, but the game doesn't start.  After 
a minute I get the opening screen with the man in yellow suit, but no mouse 
controls at all.  I can alt-tab and try to switch to other screens, but that 
doesn't work.  I stay locked in the game screen with no way out.
I can CTL-ALT-F3 and open a terminal session and restart the computer.
I have Nvidia card that has always worked before.

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https://bugs.launchpad.net/bugs/1849217

Title:
  Steam game freezes on startup (only on Xorg session)

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