Hi Robert. I am quite busy at the moment to try it, but the general idea of it
is:1. mount the disk image with mount -o loop2. cp -a source to usb3. Run
syslinux to make bootable USB drive.Hope this helps,Dmitriy
-------- Original message --------From: "Robert P. J. Day via linux"
<[email protected]> Date: 2025-08-22 16:00 (GMT-05:00) To: OCLUG mailing
list <[email protected]> Subject: [linux] $100 bounty for resolving my
issue for creating bootable USB drive i will recap the fight i am currently
having in trying to create abootable USB drive from Ubuntu Server 24.04.3
["24.04"], and i willinterac $100 to the first person who can solve the problem
i am aboutto describe. (i will start writing this up in detail at
mycrashcourse.ca wiki, but i'll supply enough here that you will haveenough
information to take a crack at it.) previously, i described how i want to
customize a 24.04 ISO image toadd some autoinstall configuration, but the
problem here is waysimpler -- i just want to take that original ISO and turn it
into abootable USB drive *as is*. but wait ... there's more. if i just want an
equivalent bootable USB drive from the ISO image,well, that's trivial -- just
"dd" from the ISO image to the USB drive.that works just fine and, when i do
that, the USB drive is recognizedby two different appliances i'm playing with
when i go into the BIOSon either appliance, go top the "Boot" menu, and i can
see that bothBIOSes list the USB drive as a boot option. in short, those USB
drivesare visible as bootable devices. and that's what i'm after. but i don't
just want to use "dd" -- that's too easy. rather, i wantto take the 24.04 ISO
image and *unpack* it ("mount -o loop","bsdtar", whatever) to get the directory
structure, which is where iwould add the autoinstall stuff, but i want to keep
it simple, andafter i unpack the ISO image, i'm happy to *immediately* pack it
upagain (unchanged) to get the equivalent bootable ISO image. then i can"dd"
that to a USB drive and boot from that. that's it -- i want to take
canonical's 24.04 ISO image, unpack it(however you want), then recreate a
bootable ISO image from that (mostlikely with "xorriso"), dd to USB drive and
boot from that. and frommy poking around, it seems like the work involves
invoking "xorriso"with all of the appropriate options, a good example seen
here:https://www.reddit.com/r/Ubuntu/comments/1g0cq09/how_to_create_a_custom_ubuntu_24041_image_by/that
makefile ostensibly does what i want, except we can ignore allthe cloud-init
stuff since i don't want to make any changes, and thereal work is done by the
"ubuntu" target, which runs "xorriso" with atruckload of options in order to
recreate a bootable ISO image. i used something very much like that but, no
matter how i tweak it,once i recreate an ISO image and copy to USB drive,
neither appliancerecognizes that USB drive as a boot option, so i am
clearlyoverlooking something critical. there's the $100 bounty -- figure out
the magic incantation of"xorriso" that allows me to do the above: 1) start
with canonical 24.04.3 ubuntu server image 2) unpack into directory structure
3) use xorriso to immediately repack into bootable ISO image 4) copy to USB
drive, and boot from that USB drivei've played with those options all morning
and haven't succeeded.thoughts?rdayTo unsubscribe send a blank message to
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