justin@justin-desktop:/media/c78416fe-f2e4-4a4c-b974-553a09b1a4d4$ fdisk -l -u laptopbackup.img
You must set cylinders.
You can do this from the extra functions menu.

Disk laptopbackup.img: 0 MB, 0 bytes
255 heads, 63 sectors/track, 0 cylinders, total 0 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: 0xcf410ed0

           Device Boot      Start         End      Blocks   Id  System
laptopbackup.img1            2046   409593855   204795905    5  Extended
Partition 1 has different physical/logical endings:
     phys=(1023, 254, 63) logical=(25496, 9, 49)
laptopbackup.img2   *   409593856   409798655      102400    7  HPFS/NTFS
Partition 2 has different physical/logical beginnings (non-Linux?):
     phys=(1023, 254, 63) logical=(25496, 9, 50)
Partition 2 has different physical/logical endings:
     phys=(1023, 254, 63) logical=(25508, 200, 36)
laptopbackup.img3       409798656   625139711   107670528    7  HPFS/NTFS
Partition 3 has different physical/logical beginnings (non-Linux?):
     phys=(1023, 254, 63) logical=(25508, 200, 37)
Partition 3 has different physical/logical endings:
     phys=(1023, 254, 63) logical=(38913, 37, 36)
laptopbackup.img5            2048    78125055    39061504   83  Linux
laptopbackup.img6       405688320   409593855     1952768   82  Linux swap / Solaris
laptopbackup.img7        78127104   405671935   163772416   83  Linux

Partition table entries are not in disk order