grub2

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: 128.0 GB, 128035676160 bytes
255 heads, 63 sectors/track, 15566 cylinders, total 250069680 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   250069679   125034839+  ee  GPT

Disk /dev/sdb: 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: 0x000867a9

   Device Boot      Start         End      Blocks   Id  System
/dev/sdb3            2048   976773119   488385536    7  HPFS/NTFS/exFAT
ubuntu@ubuntu:~$ sudo mount /dev/sda /mnt
mount: block device /dev/sda is write-protected, mounting read-only
mount: you must specify the filesystem type
ubuntu@ubuntu:~$ sudo mount --bind /dev/ /mnt/dev
mount: mount point /mnt/dev does not exist
ubuntu@ubuntu:~$ sudo chroot /mnt
chroot: failed to run command ‘/bin/bash’: No such file or directory
ubuntu@ubuntu:~$