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Installing GRUB to make a hybrid UEFI/MBR bootable USB stick

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  Installing GRUB to make a hybrid UEFI/MBR bootable USB stick Nicolas George <george@nsup.org> - 2021-03-03 17:00 +0100
    Re: Installing GRUB to make a hybrid UEFI/MBR bootable USB stick <tomas@tuxteam.de> - 2021-03-03 18:30 +0100

#232317 — Installing GRUB to make a hybrid UEFI/MBR bootable USB stick

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Hi.

I have written a howto on installing GRUB on an USB stick to make it
bootable both on UEFI and legacy MBR systems.

It allows to install multiple ISO images of live distros as plain files
in an unobtrusive directory while keeping the stick usable to carry
around vacation photos, torrents of Baby Yoda or office documents of
legal threats.

It also has some nice JavaScript to compute the exact commands to type
depending on the size of your particular USB stick.

I want to share it here, since it can be useful. With USB sticks
nowadays being 32, 64, 128 gigaoctets, it becomes increasingly annoying
to overwrite one whole just to install or repair a system.

http://nsup.org/~george/comp/live_iso_usb/grub_hybrid.html

Also, my access to non-Linux systems is limited, and I would appreciate
if people could confirm that the resulting USB stick can be used with
other systems. With previous iterations, Windows wanted and failed to
“format” the drive.


Finally, I have tried and failed to configure Debian Live to enable
persistence.

I want the persistent state to be stored in a file under the boot/
directory of the stick, preferably in a file named debian_persist.img
but any name will do.

I have tried to generate this file with truncate and mkfs.ext4, then
mounted it to create persistence.conf with “/ union” in it, named it
boot/persistence, and booted with options “persistence
persistence-path=/boot”, but it had no effect, and I do not know where I
can find useful diagnostic info to see precisely what is going on.

Suggestions would be appreciated, but do not invest too much time in it,
as I have not yet done so myself.

Regards,

-- 
  Nicolas George

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#232320

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On Wed, Mar 03, 2021 at 04:52:49PM +0100, Nicolas George wrote:
> Hi.
> 
> I have written a howto on installing GRUB on an USB stick to make it
> bootable both on UEFI and legacy MBR systems.

Thanks, that sounds very useful :)

Cheers
 - t

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