How can I add a menu entry in grub 2 for an os on a btrfs partition?
Currently update-grub does not detect an os on a btrfs partition.
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Sign up to join this communityThe answer might be too ubuntu specific, I apologise for that.
To add a menu entry, you have to edit /etc/grub.d/40_custom
.
Append the following to the end of the file:
menuentry "GIVE AN ENTRY NAME" {
set root=(hd0,5)
linux /@/vmlinuz root=UUID=xxx-xxx-xxx-xxx-xxxxx rootflags=subvol=@ ro quiet splash
initrd /@/initrd.img
}
You have to change (hd0,5)
to reflect your partition. If grub and the desired partition are on the same hard drive use hd0, else you might need to experiment a bit with hd1, hd2 etc. Instead of 5 use the number of the partition.
To find out the UUID of the partition use blkid
It is possible that your subvolume is not named @
(that's ubuntus default), but something else. You can find out the name if you mount the partition and list its the folders