I found answer near to this question but not exact answer in Ubuntu-forums.I found answer to
- How to create swap partition after installing Ubuntu.
- How to create or add swap file to existing swap partition.
But now for this question. Since at the time of installation i don't know the use of swap partition, i installed Ubuntu 12.10 without swap partition and i used second method as mentioned in "http://www.thegeekstuff.com/2010/08/how-to-add-swap-space/" to create swapfile and got this error while using mkswap
# mkswap /root/myswapfile Setting up swapspace version 1, size = 1048572 KiB **no label, UUID=cc477ba5-e2d9-495c-a63b-300c4e5e0048**
and each time UUID differs. But i ignored and continued with next steps and when i tried to hibernate my system i got these errors
PM: swap header not found, cannot get swap device try swapon -a, cannot get swap writer
I just want to hibernate my system only using swapfile without creating swap partition. Is it possible? I'm new to ubuntu.