recover_grub2

ubuntu@ubuntu:~$ sudo su
root@ubuntu:/home/ubuntu# fdisk -l

Disk /dev/sda: 320.1 GB, 320072933376 bytes
255 heads, 63 sectors/track, 38913 cylinders, total 625142448 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disk identifier: 0x00073736

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *        2048   186062847    93030400    7  HPFS/NTFS/exFAT
/dev/sda2       186062848   248309759    31123456    7  HPFS/NTFS/exFAT
/dev/sda3       248309760   268789759    10240000   83  Linux
/dev/sda4       268789760   625141759   178176000    5  Extended
/dev/sda5       549278478   592364744    21543133+  83  Linux
Partition 5 does not start on physical sector boundary.
/dev/sda6       592375808   625141759    16382976   82  Linux swap / Solaris
root@ubuntu:/home/ubuntu#