I also wonder if this might be another HP BIOS bug like bug 1906086...
Please try changing your BIOS mode to legacy BIOS (or to UEFI if it's
already legacy). But be warned; you may need to reinstall Ubuntu in
order to boot again after changing the setting.

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https://bugs.launchpad.net/bugs/1939173

Title:
  [HP 120-1100eo API] Screen flickering white vertical lines

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