ubuntu@ubuntu:~$ sudo fdisk -l

Disk /dev/sda: 640.1 GB, 640135028736 bytes
255 heads, 63 sectors/track, 77825 cylinders, total 1250263728 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: 0x5dd7c42c

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1            2048    31459327    15728640   27  Hidden NTFS WinRE
/dev/sda2   *    31459328    31664127      102400    7  HPFS/NTFS/exFAT
/dev/sda3        31664128   694585343   331460608    7  HPFS/NTFS/exFAT
/dev/sda4       694587390  1250263039   277837825    5  Extended
/dev/sda5      1238355968  1250263039     5953536   82  Linux swap / Solaris
/dev/sda6       694587392  1226446847   265929728   83  Linux
/dev/sda7      1226448896  1238353919     5952512   82  Linux swap / Solaris

Partition table entries are not in disk order

Disk /dev/sdb: 8053 MB, 8053063680 bytes
255 heads, 63 sectors/track, 979 cylinders, total 15728640 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/sdb1   *        2048    15728639     7863296    b  W95 FAT32

Disk /dev/sdc: 32.0 GB, 32015679488 bytes
255 heads, 63 sectors/track, 3892 cylinders, total 62530624 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/sdc1              32    62530623    31265296    c  W95 FAT32 (LBA)
ubuntu@ubuntu:~$ sudo mount /dev/sda6
mount: can't find /dev/sda6 in /etc/fstab or /etc/mtab
ubuntu@ubuntu:~$ sudo mount/dev/sda6
sudo: mount/dev/sda6: command not found
ubuntu@ubuntu:~$ sudo mount /dev/sda6
mount: can't find /dev/sda6 in /etc/fstab or /etc/mtab
ubuntu@ubuntu:~$ sudo mount /dev/sda6/mnt/boot
mount: can't find /dev/sda6/mnt/boot in /etc/fstab or /etc/mtab
ubuntu@ubuntu:~$ sudo mount /dev/sda6/ mnt/boot
mount: mount point mnt/boot does not exist
ubuntu@ubuntu:~$ cd mnt/boot
bash: cd: mnt/boot: No such file or directory
ubuntu@ubuntu:~$ cd mnt
bash: cd: mnt: No such file or directory
ubuntu@ubuntu:~$ sudo mount /dev/sda6
mount: /dev/sda6 already mounted or /media/ubuntu/aa9a8b40-8489-4309-992e-5ffe0533bc41 busy
mount: according to mtab, /dev/sda6 is already mounted on /media/ubuntu/aa9a8b40-8489-4309-992e-5ffe0533bc41
ubuntu@ubuntu:~$ sudo grub-install --root-directory=/mnt/ /dev/sda
Path `/mnt/boot/grub' is not readable by GRUB on boot. Installation is impossible. Aborting.
ubuntu@ubuntu:~$ sudo grub-install --root-directory=/mnt/ /dev/sda
Path `/mnt/boot/grub' is not readable by GRUB on boot. Installation is impossible. Aborting.
ubuntu@ubuntu:~$ sudo grub-install --root-directory=/mnt/ /dev/sda
Path `/mnt/boot/grub' is not readable by GRUB on boot. Installation is impossible. Aborting.