Dear Maintainer,
I noticed some moths ago a delay between Grub gets
started ("Welcome to GRUB!") and Grub shows the menu.
I switched a few days ago from stable to Bullseye/testing
at this device and tried to find out where this 23 seconds
delay is coming from.
After some tests I found that /etc/grub.d/05_debian_theme
is convinced that the root partition is readable by Grub.
Unfortunately this is not the case, as root is on a micro-sd card,
just boot is on the internal MMC. Also the EFI shell did
not recognize the partition table of that micro-sd, as far as I see.
The "search" command below takes these 23 seconds.
As a workaround I copied grub-16x9.png from
/usr/share/desktop-base/futureprototype-theme/grub
to /boot/grub/ and did "update-grub".
Now the delay is gone and the background image is shown by Grub.
I wonder why the background image is not
copied to the boot partition by default?
Kind regards,
Bernhard