Mám obavy aby to nebylo poněkud složitější.
ubuntu@ubuntu:~$ sudo fdisk -l
WARNING: GPT (GUID Partition Table) detected on '/dev/sda'! The util fdisk doesn't support GPT. Use GNU Parted.
Disk /dev/sda: 500.1 GB, 500107862016 bytes
255 heads, 63 sectors/track, 60801 cylinders, total 976773168 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000
Device Boot Start End Blocks Id System
/dev/sda1 1 976773167 488386583+ ee GPT
Disk /dev/sdb: 32.0 GB, 32027705344 bytes
255 heads, 63 sectors/track, 3893 cylinders, total 62554112 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x000db914
Device Boot Start End Blocks Id System
/dev/sdb1 * 2048 62554111 31276032 c W95 FAT32 (LBA)
ubuntu@ubuntu:~$ sudo blkid
/dev/loop0: TYPE="squashfs"
/dev/sda1: UUID="CC22-6404" TYPE="vfat"
/dev/sda2: UUID="8289e19c-7975-4930-9fe1-374351b9cab6" TYPE="ext4"
/dev/sda3: UUID="d25a0bb6-381a-42a3-9ce1-2a6613e8ae8c" TYPE="ext4"
/dev/sda4: UUID="9ca059de-0102-4f3c-94aa-89dda2afe3f3" TYPE="swap"
/dev/sdb1: UUID="89B9-DA82" TYPE="vfat"
ubuntu@ubuntu:~$ sudo mount -t ext4 /dev/sda2 /mnt
ubuntu@ubuntu:~$ sudo grub-install --root-directory=/mnt /dev/sda
/usr/sbin/grub-bios-setup: warning: this GPT partition label contains no BIOS Boot Partition; embedding won't be possible.
/usr/sbin/grub-bios-setup: warning: Embedding is not possible. GRUB can only be installed in this setup by using blocklists. However, blocklists are UNRELIABLE and their use is discouraged..
/usr/sbin/grub-bios-setup: error: will not proceed with blocklists.
ubuntu@ubuntu:~$