it doesnt let me add a logical partition,I get an error ,"No free sectors available", but it lets me add more primary (linux)partitions
Some of this partitioning stuff can be tricky. First, a few basics of partitioning. A physical disk can only have 4 partitions, either primary or extended. Logical partitions are not real partitions and cannot exist by themselves. They can only exist as structures within an extended partition. Although you can only have 4 primary and extended partitions, you can have as many logical partitions inside an extended partition as you want.

In your setup, hda1 is primary. hda2 is the second (extended) partition and contains logical partition hda5. Since hda2 and hda5 are the same size, there is no more room in your extended partition. And you can't put a logical partition in the empty space because it has to be inside an extended partition. Basically, you have to create an extended before you can create a logical.

You have 2 options:
1) Get Partition Magic and stretch hda2 out so there is room in it after hda5; or
2) Create a new extended partition in your empty space which will be hda3, and then put several logical partition inside it which will be hda6, hda7, etc....

I intend to make 2 primary partitions for linux and 1 logical swap.
Can't do it like that, because then you would have more than 4 partitions on your disk.

Hope this helps.

PS - Just for future reference, this thread is in the wrong forum.