I suppose it is a kernel bug, this is the output of xrandr
 
xrandr: Failed to get size of gamma for output default
Screen 0: minimum 1920 x 1080, current 1920 x 1080, maximum 1920 x 1080
default connected 1920x1080+0+0 0mm x 0mm
   1920x1080     77.00* 

I do not see another screen

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https://bugs.launchpad.net/bugs/1847603

Title:
  After upgrading Ubuntu 19.10 second screen not detected

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