I must say, that I am surprised :-)
mkusb version 12.6.1 can create persistent live drives, that boot both in BIOS mode and UEFI mode, also with secure boot from the current daily Xubuntu Groovy iso file. I used the setting 'usb-pack-efi'.
$ ls -l xubuntu/groovy-desktop-amd64.iso -rw------- 1 sudodus sudodus 1803091968 sep 12 02:07 xubuntu/groovy-desktop-amd64.iso
See the attached screenshot.
-o-
When cloned to a USB drive, this file does not boot in BIOS mode.
I must say, that I am surprised :-)
mkusb version 12.6.1 can create persistent live drives, that boot both in BIOS mode and UEFI mode, also with secure boot from the current daily Xubuntu Groovy iso file. I used the setting 'usb-pack-efi'.
$ ls -l xubuntu/ groovy- desktop- amd64.iso groovy- desktop- amd64.iso
-rw------- 1 sudodus sudodus 1803091968 sep 12 02:07 xubuntu/
See the attached screenshot.
-o-
When cloned to a USB drive, this file does not boot in BIOS mode.