I never have seen this grub menu with Ubuntu Life media, even when burned to CD. The reason may be, that I regularly use MultiSystem since some years or never had a EFI machine in my hands before using MultiSystem (does this grub menu appear also on BIOS machines?).
But a problem remains ... I suspect, the "change media trick" will work with USB media instead CD media.
Maybe I can try your steps 4), 5) after booting via MultiSystem ... "Try Ubuntu" with 32-bit ISO.
@Alkis, thanks for being back again.
I never have seen this grub menu with Ubuntu Life media, even when burned to CD. The reason may be, that I regularly use MultiSystem since some years or never had a EFI machine in my hands before using MultiSystem (does this grub menu appear also on BIOS machines?).
But a problem remains ... I suspect, the "change media trick" will work with USB media instead CD media.
Maybe I can try your steps 4), 5) after booting via MultiSystem ... "Try Ubuntu" with 32-bit ISO.