Ubuntu on MacPro 2013 Grub Menu Does Not Show

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Environment: ubuntu 23.04, Trashcan MacPro 2013, Thunderbolt Display on Thundrebolt.

Grub Configuration:

# If you change this file, run 'update-grub' afterwards to update
# /boot/grub/grub.cfg.
# For full documentation of the options in this file, see:
#   info -f grub -n 'Simple configuration'

GRUB_DISTRIBUTOR=`lsb_release -i -s 2> /dev/null || echo Debian`

# Uncomment to enable BadRAM filtering, modify to suit your needs
# This works with Linux (no patch required) and with any kernel that obtains
# the memory map information from GRUB (GNU Mach, kernel of FreeBSD ...)

# Uncomment to disable graphical terminal (grub-pc only)

# The resolution used on graphical terminal
# note that you can use only modes which your graphic card supports via VBE
# you can see them in real GRUB with the command `vbeinfo'

# Uncomment if you don't want GRUB to pass "root=UUID=xxx" parameter to Linux

# Uncomment to disable generation of recovery mode menu entries

# Uncomment to get a beep at grub start
#GRUB_INIT_TUNE="480 440 1"

Tried all of the above and menu does not show. As a matter of fact nothing shows and just a black screen until the prompt shows to enter the full disk decryption password.

Also i think the proper way to update grub is: sudo grub-mkconfig -o /boot/grub/grub.cfg

I sit in a Tesla and translated this thread with Ai:


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