Failure installing Ubuntu 24.04 on an USB stick

[Ralf Mardorf]

Hi Volker,

are you using a file system that isn't supported by either GRUB or EFI?

https://wiki.archlinux.org/title/GRUB

FWIW I have a separated fat32 partition for the EFI stuff and ext4 /boot
partitions for the Alpine, Xubuntu and Arch kernels.

I migrated from syslinux to GRUB, since the GPU of my 13th Gen Intel
Core doesn't allow legacy boot.

For legacy boot machines I would still use syslinux. However, GRUB still
works with legacy boot, too.

Btw. on my enforced EFI boot machine, I have at least secure boot
disabled.

Back to GRUB and legacy boot, resp. MBR and legacy boot:

"# grub-install --target=i386-pc /dev/sdX"

https://wiki.archlinux.org/title/GRUB#Master_Boot_Record_(MBR)_specific_instructions

"i386-pc" is also for 64 bit machines.

Regards,
Ralf