Also affected on Desktop. (Threadripper 3970X, 5700XT)

Solution:
1) Disconnect all monitors but one before turning on the computer.
2) Disconnect all monitors but one while experiencing the black screen. Then i 
get to the desktop.

Reconnecting monitors after boot crashes the system.
So i am stuck at single-monitor use...


Please give instruction on how to give more technical details, if required.

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https://bugs.launchpad.net/bugs/1882992

Title:
  Upon update te 5.4.0-37-generic, boot hangs with black screen

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