I found to resolve steps.

1. purple screen flash occur /dev/sda2 ubuntu-18.04.3 at i3-7100 PC
2. ctr-alt-del reboot
3. mbm039 call /dev/sda2 grub menu, and select adbanced options for Ubuntu,
   select Ubuntu, with Linux 5.0.0-27-generic(recovery mode)
4. select resume, and ok. ubuntu-18.04.3 startup normaly.

but next reboot, purple screen blink occur sometimes.

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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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