file system type = extended not able to mount

[Alan Pope]

On 15 September 2011 00:32, shivam tiwari <bigbang4u2 at gmail.com> wrote:
> /dev/sda1 fat16
> /dev/sda2 ntfs
> /dev/sda3 ntfs
> /dev/sda4 extended
>    /dev/sda5 linux-swap
>    /dev/sda6 ext4
> unallocated unallocated
>
> sda5 and sda6 are in dropdown list of sda4

5 and 6 are logical partitions _inside_ the extended partition of sda4. [0]

> I have windows7 installed on sda3, ubuntu 10.10 (upgrated to 11.04) on sda4
> and new ubuntu 11.04 on sda6.
>

I suspect you have done a new install over the top of whatever you had
in 4, and have now lost it.

Al.

[0] http://en.wikipedia.org/wiki/Disk_partitioning#Extended_partition