thanks for your time.
You are right there swap, ill create now. My doubt is , if hibernation is not working / enabled becasue there was no swap, but still i could be able to find hibernate option showing in power options right. i mean my openion, don't know correct or not.
one more confusions is every one is using different , differnt files for this task. let say we need to modify below file
but i found some one editing 10-local.d and some use 20-local.d. which one is the correct file and what should i add in there.
Thanks in advance.