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grub2 and linux from scratch



grub2 is doing something I don't understand.

/etc/default/grub has the line:
GRUB_DISTRIBUTOR=`lsb_release -i -c -s 2> /dev/null || echo Debian`

the boot menu shows:

linux from scratch gnu/linux
advanced options for linux from scratch etc.
debian gnu/linux (jessie/sid) on sda2
advanced options for debian gnu/linux, etc.

I have two instances of debian - on sda1 jessie and on sda2 sid.

sid has no boot loader, and grub is written to /dev/sda by jessie.

What is this linux from scratch? And why does grub then correctly
describe the discovered distribution?

I believe that I can fix the problem by using a custom menu, but I am
puzzled by the "linux from scratch" thing.


John.


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