Different Linux distributions have different target users. Ubuntu, at the moment, places an emphasize on mobile devices, which may be the reason why...
My understanding is that hibernation has been disabled by default since it seems to cause a lot of problems on different laptop models.
With respect...
What exactly do you mean by "outside of the Ubuntu software store"? Can you post the error messages or, ideally, the complete output of what you are...
I know that certain Lenovo models have such a feature, I don't know whether Dell has it also. Anyways, even if there is such a feature it also has to...