I stopped my PC, purple screen to change white dot to red dot repeat for ever.
I reset hardware switch, and reboot.
boot up pc, purple screen blink occur.
and reset hardware switch again, but boot up pc purple screen blink again.
I power Off my PC.
I think shutdown ubuntu step, something bad.

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https://bugs.launchpad.net/bugs/1840571

Title:
  ubuntu 18.04.3 startup purple screen blink and could not start with
  kernel 5.0.0+

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