Sorry to ask a hardware related question. Hope it's relevant enough to Ubuntu users in general not to get instantly down-voted and marked as a replica as a related hardware question did. I hope it's useful to others, as this hardware question was! (Subtle difference: I'm asking where do I find information, not what is the information).
I know the main ports of call:
- Ubuntu hardware support (Lenovo doesn't even seem to be listed)
- Ubuntu certified (lists v580 as being compatible: good sign, but not enough to overcome concerns about uefi)
- Google (a load of scare stories about UEFI problems, which I suspect are the minority, but struggling to find a similarly large stash of "it works fine" stories.
These are general problems, so please think about the best generic steps that you would take when looking into a new lappy. And people less experienced with Ubuntu compatible hardware purchases (I've bought a few and it's still really hard - imagine what it's like for someone completely new to the wonderful world of Linux and computer hardware).