You must set cylinders.
You can do this from the extra functions menu.

Disk /var/backup/kulthea.img: 0 MB, 0 bytes
255 heads, 63 sectors/track, 0 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

                  Device Boot      Start         End      Blocks   Id  System
/var/backup/kulthea.img1   *           1         486     3903763+  83  Linux
/var/backup/kulthea.img2             487         729     1951897+  83  Linux
/var/backup/kulthea.img3             730         851      979965   83  Linux
/var/backup/kulthea.img4             852        2055     9671130    5  Extended
Partition 4 has different physical/logical endings:
     phys=(1023, 254, 63) logical=(2054, 254, 63)
/var/backup/kulthea.img5            1994        2055      498015   82  Linux swap / Solaris
/var/backup/kulthea.img6             852        1992     9165019+  83  Linux

Partition table entries are not in disk order