4 ms·

Are you referring to grub2iso[1]? If so, I was never able to make it work: either the ISO is too large (IIRC, in the old days it needed to load the full ISO to

Are you referring to grub2iso[1]? If so, I was never able to make it work: either the ISO is too large (IIRC, in the old days it needed to load the full ISO to memory), or, if it did boot, the kernel wouldn't find the ISO ("virtual drive") itself. I only got it to work with simple things that load fully from RAM -- say, debian-installer, which only requires kernel+initrd. It has to be simple and reliable. If it's only one of them, I would rather carry an extra USB stick which I can always format (I do). [1]: https://help.ubuntu.com/community/Grub2/ISOBoot https://help.ubuntu.com/community/Grub2/ISOBoot

dataflow 5y ago
It was painful but I got Ubuntu ISO working with loopback loop (hd0,gpt1)/PATH/TO/UBUNTU.iso set root=(loop) configfile /boot/grub/loopback.cfg which in turn seems to load the kernel via linux /casper/vmlinuz file=/cdrom/preseed/ubuntu.seed iso-scan/filename=/PATH/TO/UBUNTU.iso initrd /casper/initrd if you just make sure your path doesn't have spaces. (I forget if you also need to pass boot=casper or not.) You'll have to detect the disk though. It's possible to automate it somewhat, but not trivial (at least if you don't know how). You'll want to use search. https://www.gnu.org/software/grub/manual/grub/html_node/search.html https://www.gnu.org/software/grub/manual/grub/html_node/sear... And make sure you've insmod'ed any modules you need for your hardware if necessary (storage, USB, etc.)... unfortunately documentation on these is poor, and some modules are mutually exclusive, so have fun.