Thread: Existing partitions are not being detected during installation

hi,
trying install ubuntu 11.10 on windows 7.i have 160 gb hardisk divided in 4 partitions , arround 30 gb unallocated space.but when try install ubuntu ,my partitions not being detected.even gparted not able detect partitions.

output of sudo fdisk -lu is

disk /dev/sda: 160.0 gb, 160041885696 bytes
255 heads, 63 sectors/track, 19457 cylinders, total 312581808 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: 0xdd36dd36

device boot start end blocks id system
/dev/sda1 * 63 81915434 40957686 7 hpfs/ntfs/exfat
/dev/sda2 81915435 312560639 115322602+ f w95 ext'd (lba)
/dev/sda3 163830933 245746304 40957686 7 hpfs/ntfs/exfat
/dev/sda5 81915498 103410404 10747453+ 7 hpfs/ntfs/exfat
/dev/sda6 103410468 163830869 30210201 b w95 fat32

disk /dev/sdb: 4012 mb, 4012900352 bytes
120 heads, 55 sectors/track, 1187 cylinders, total 7837696 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: 0x00000000

device boot start end blocks id system
/dev/sdb1 32 7837695 3918832 b w95 fat32

disk /dev/mapper/live-rw: 4294 mb, 4294967296 bytes
255 heads, 63 sectors/track, 522 cylinders, total 8388608 sectors
units = sectors of 1 * 512 = 512 bytes
sector size (logical/physical): 512 bytes / 512 bytes
i/o si gibe (minimum/optimal): 512 bytes / 512 bytes
disk identifier: 0x00000000

disk /dev/mapper/live-rw doesn't contain valid partition table

disk /dev/mapper/live-osimg-min: 4294 mb, 4294967296 bytes
255 heads, 63 sectors/track, 522 cylinders, total 8388608 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: 0x00000000

disk /dev/mapper/live-osimg-min doesn't contain valid partition table

when run gparted following information

file system : unallocated

size: 149.05 gib


appreciated

it looks sda3 primary, inside extended partition not possible. logical partitions can inside extended.

may able change logical.

partition table first , save file device:
sudo sfdisk -d /dev/sda > parts.txt

convert partition primary logical, @ least 1 free (unallocated) sector must exist between partition , 1 precedes it.
fixparts - repair broken partition tables (not overlapping issues) & delete stray gpt data mbr drives
http://ubuntuforums.org/showthread.php?t=1705325
http://www.rodsbooks.com/fixparts/

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