I am installing ubuntu in my laptop. This is my current disk partition.
/dev/sdb1 = 170GB primary that install ubuntu
/dev/sdb2 = 140GB logical
/dev/sdb3 = 160GB logical
/dev/sdb4 = 155GB logical
/dev/sdb5 = 3GB swap area
/dev/sdb1 = 15GB unknown (not allocated)
I want this /dev/sdb1 15 GB unknown (not allocated) to use as swap area with /dev/sdb3
This 15 GB is not merged with /dev/sdb1 primary.