Comment 25 for bug 10661

TestDisk[1] fixed it for me. When I reinstalled with Feisty (i386), I didn't have this problem.

Disk /dev/sda: 320.0 GB, 320072933376 bytes
255 heads, 63 sectors/track, 38913 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

   Device Boot Start End Blocks Id System
/dev/sda1 * 1 8447 67850496 7 HPFS/NTFS
/dev/sda2 37764 38913 9230760 c W95 FAT32 (LBA)
/dev/sda3 8448 37293 231705495 83 Linux
/dev/sda4 37294 37763 3775275 5 Extended
/dev/sda5 37294 37763 3775243+ 82 Linux swap / Solaris

Partition table entries are not in disk order

[1] http://www.cgsecurity.org/wiki/TestDisk