some times the partitions not mounted on ubuntu you must mount these manually use this command for know the address of partition " fdisk -l " and you must create folders in /media/ like rootfs and home and MyDocs and mount the partitions manually on these folder ex " mount /dev/sdb3 /media/MyDocs"
and when i use this command sudo fdisk -l it just show: Disk /dev/sda: 21.5 GB, 21474836480 bytes 255 heads, 63 sectors/track, 2610 cylinders, total 41943040 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: 0x000a4b86 Device Boot Start End Blocks Id System /dev/sda1 * 2048 37750783 18874368 83 Linux /dev/sda2 37752830 41940991 2094081 5 Extended /dev/sda5 37752832 41940991 2094080 82 Linux swap / Solaris that mean no additional drive detected or added