Happening to me on HP EliteBook 8460p UEFI install and Ubuntu MATE 20.04!
Tried all sorts of GRUB_TIMEOUT and GRUB_TIMEOUT_STYLE settings to no avail. 

GRUB menu *IS* actually there but it won't show up: it just freezes on a
black screen until the timeout expires or a key is pressed.

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https://bugs.launchpad.net/bugs/1836934

Title:
  eoan boot hides grub menu

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