Same issue with a Lenovo T450s (integrated Intel graphics) with a fresh
20.04 install next to Windows.

At first, if I entered the bios config and then exited, I could get the
grub menu as expected with a high resolution.

I tried Alex Barris' suggestion and changed to Legacy/UEFI from UEFI
only and now I get a low resolution splash screen and see the grub menu.
This is true even if I change my boot config back to UEFI only.  So it's
working, but now stuck in a low resolution.

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https://bugs.launchpad.net/bugs/1863434

Title:
  20.04 grub menu not visible

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