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Grub error message on boot

ng flag

I followed this guide to get rid of an annoying 40 second white screen delay on my MacBook Pro (MBP5,2) during boot. As a TL;DR it involves deleting Ubuntu's /boot/efi partition and then recreating it as a HFS+ partition and installing grub into that because that's what the Apple firmware wants.

It fixed my original problem, but now after turning on the computer I get a black screen with the following two error messages:

error: no server specified.
error: no suitable video mode found.

This screen remains for about 10 seconds and then Grub continues to boot the system normally. What do they mean and how can I get rid of them?

I haven't changed anything in my /etc/default/grub config and it only contains these lines:

GRUB_DEFAULT=0
GRUB_TIMEOUT_STYLE=hidden
GRUB_TIMEOUT=0
GRUB_DISTRIBUTOR=`lsb_release -i -s 2> /dev/null || echo Debian`
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
GRUB_CMDLINE_LINUX=""

I did a sudo upgrade-grub but the error messages still remain.

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

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