I installed Ubuntu 11.04 Natty and I set a partition for swap about 900 MB. Afterthat, I installed Kubuntu 12.10 Quantal, repartitioned my hard disk so I had 2048 MB swap (replaced 900 MB swap partition).
I ran Kubuntu, and it's ok. But after I ran Ubuntu 11.04 Natty, It didn't use that swap. But I can activate it with Gparted.
Some additional information. When I installed Kubuntu Quantal. I make 256 MB partition (ext4 mount point in /boot) which replaced previous 256 MB partition (ext4 mount point in /boot) that I created when I installed Natty.
Something wrong with my configuration?.