I installed Ubuntu on my Windows 7 Sager laptop using Wubi. Hibernate (i.e. suspend to disc) is not an option from the power icon, only suspend, shutdown, etc. Hibernate is also not an option from my battery/lid close options. I understand that hibernation is disabled by default in Ubuntu 12.04. I tried running pm-hibernate but I get the following message:

Looking for splash system... none 
s2disk: Snapshotting system

and then the computer just hangs with a black screen. According to the documentation here if this fails then I can't enable hibernate but it offers no help in making pm-hibernate succeed.

Could swap be my problem? It looks like I have very small swap:

user@ubuntu:~$ cat /proc/swaps
Filename                Type        Size    Used    Priority
/host/ubuntu/disks/swap.disk            file        262140  0   -1

The advice on SwapFaq is only for the author's set up (e.g. I don't have an Ubuntu install disk since I used Wubi) and he says that 'INFO: This will not work for 12.04, resume from hibernate work differently in 12.04.'

Any advice? I really need to get hibernate working to use my laptop as a, er, laptop.

Thanks