AFAIK, there can not be more than 4 primary partitions in one HDD because of the size limit of the MBR.
I've installed Ubuntu 12.04 and Windows 7 together.
Here is the screenshot captured from Windows 7 Disk Management Tool (built-in)
But, how can "Primary Partition" be located in "Extended Partition"?
- /dev/sda8 is for SWAP
- /dev/sda9 is for '/boot'
- /dev/sda10 is for '/'