Public bug reported:

On MacBook Pro (2010) Ubuntu 20.4.1 LTS and 18.4.5 LTS recognizes a second 
interlinked screen which doesn't exist. This happens also in the Try mode when 
Ubuntu sill isn't installed and also after update. You can push the mousecurser 
from the left (2) to the right (1) screen or you can change in the screen in 
the settings. But then you can do nothing, because the setting window comes on 
that screen which doesn't esist. You even can not shutdown. If you set the 
computer to only one screen, the setting is reset to the former setting with 
the two screens. But mostly you can't confirm the setting because the screen 
turn black for more then 10 seconds. I found a workaround by starting the 
recovery version. 
3,7GiB, Intel core i5CPU m520 2.4GHz x 4, graphic llvmpipe (LLVM 10.0.0, 128 
bits, GNOME 3.28.2 64 bit 
The computer sent no error message.

** Affects: ubuntu
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1911245

Title:
  interlinked second screen is switched on althogh there is none -
  macBook Pro 2010 - ubuntu 20.4 LTS, 18.4 LTS

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