This question already has an answer here:
- Xubuntu 14.04: how to enable hibernate? 2 answers
I am using Ubuntu 14.04. I am unable to hibernate my system with sudo pm-hibernate. The screen only flashes then it returns to desktop, nothing happens. I have a swap partition of 4GB my RAM size is 3GB. Even the hibernate tray option doesn't actually hibernate the system instead only sends the system to sleep. Kindly help.