How can I partition my system with primary paritions for dual booting?

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You can only have four primary partitions. You can make one of those be an "extended partition", which can contain a large number of "logical" partitions.

You had two primary partitions to start, and then wanted to add three more partitions. Since that's more than four, the only way that can work is for there to be an extended partition.

It's also worth nothing that there's really no downside to having these things on logical partitions.

My recommendation is to get rid of all of the partitions except for the nfs ones. Then, put all of your unpartitioned space into one, big extended partition and create all of your Linux partitions inside it as logical partitions. There's no downside to it, and it keeps things simple for you. Also, you don't need to bother making your / partition bootable because Linux doesn't care; that's an old MS-DOS artifact from the Bad Old Days when the boot loader needed that to know which partition to boot from.