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From: Robert Latest <boblatest@yahoo.com>
Newsgroups: comp.os.linux.misc
Subject: Re: How to install GRUB on removable media?
Date: 14 Sep 2021 19:51:53 GMT
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Robert Latest wrote:
> Hi all,
>
> I have this company Windows laptop that I use privately by booting from a
> USB3 SSD with a Debian installation. This used to work for years until it
> didn't any more a few days ago. Anyway, I ended up re-installing the complete
> Debian onto the same SSD again. However, I cannot figure out for the life of
> me how to make the thing bootable. The SDD usually shows up as /dev/sdc and
> has three partitions: /dev/sdc1 doesn't matter, /dev/sdc2 always was mounted
> under /boot, and /dev/sdc3 is the root device.
>
>
> In order to get the thing running I boot from the Debian install USB stick,
> mount /dev/sdc3 under /mnt, do the mount --bind thing for /proc, /sys, /dev,
> and chroot into /mnt.
>
> /dev/sdc2 is EFI type "ef", and formatted as FAT and mounted at /boot (in the
> chrooted environment). I also made a /boot/grub/efi directory.
>
> But I can't install grub: 
>
> # grub-install Installing for x86_64-efi platform grub-install: error: cannot
> find EFI directory.
>
> I've searched the Net up and down for this error message but couldn't find
> any hint on how to deal with it.
>
> Or maybe it isn't possible to use EFI on removable media? Do I have to
> install it in the MBR? My knowledge about this is extremely shaky.
>
> Thanks!

Note, I also tried grub-install --efi-directory=/boot/efi, same result.