On Sat, Jun 05, 2021 at 04:28:20PM -0500, Martin McCormick wrote:
> There's 1 UUID for the root file system in /boot/grub/grub.cfg
> which is the file one must not normally edit by hand. It
> reads
>
> menuentry 'Debian GNU/Linux' --class debian --class gnu-linux --class gnu
> --class os $menuentry_id_option
> 'gnulinux-simple-658da8df-942e-4ad7-8c5b-695f2f2eb4ed' {
Yes, there's probably a UUID for the root file system somewhere in this
entry, in the part you omitted.
The part you included just has a *name* which was automatically generated
to refer to this boot option. This name happens to include the same UUID
that the root file system designation uses, but this name is only a name,
and does not invoke any functionality.
Here's part of mine, for comparison:
menuentry 'Debian GNU/Linux' --class debian --class gnu-linux --class gnu
--class os $menuentry_id_option
'gnulinux-simple-c4691ccb-2090-491e-8e82-d7cc822db04a' {
load_video
insmod gzio
if [ x$grub_platform = xxen ]; then insmod xzio; insmod lzopio; fi
insmod part_gpt
insmod ext2
set root='hd0,gpt7'
if [ x$feature_platform_search_hint = xy ]; then
search --no-floppy --fs-uuid --set=root --hint-bios=hd0,gpt7
--hint-efi=hd0,gpt7 --hint-baremetal=ahci0,gpt7
c4691ccb-2090-491e-8e82-d7cc822db04a
else
search --no-floppy --fs-uuid --set=root
c4691ccb-2090-491e-8e82-d7cc822db04a
fi
echo 'Loading Linux 5.10.0-7-amd64 ...'
linux /boot/vmlinuz-5.10.0-7-amd64
root=UUID=c4691ccb-2090-491e-8e82-d7cc822db04a ro
echo 'Loading initial ramdisk ...'
initrd /boot/initrd.img-5.10.0-7-amd64
}
The actual UUID for the root file system appears down at the bottom, three
lines above the closing curly brace. It's where it says root=UUID=....
Of course, this is just one menu entry. I have three kernels installed
at the moment, so I have 6 of these menu entries, 2 per kernel (one
called "simple" and one called "advanced").
