I seem to have the same bug under Linux Mint 19.1 on a late 2008
MacBook.
After some upgrade a few months ago, I've got a [problem with shim-
signed][1], where I was getting "Failed to set MokListRT" error and no
GRUB menu. After purging shim-signed, the error messages were gone, but
the GRUB menu did not come back.
I tried the solution linked to from comment #23, and it worked, but
(1) the menu does not look the same as before,
(2) there seem to be somewhat unusual timeouts before the menu is shown
and after a boot option is selected, but I may be wrong.
The workaround suggested in comment #23 is to set
GRUB_TERMINAL=console
in /etc/default/grub.
[1]: https://bugs.launchpad.net/ubuntu/+source/grub2/+bug/1867092
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https://bugs.launchpad.net/bugs/1863434
Title:
20.04 grub menu not visible
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