A rather vague claim, needs more details. Canonical allow the use of the Ubuntu trademark to describe unmodified versions of Ubuntu (in this case, I'd guess it'

A rather vague claim, needs more details. Canonical allow the use of the Ubuntu trademark to describe unmodified versions of Ubuntu (in this case, I'd guess it's their cloud server images) If you modify the images, you can still redistribute them, you just can't call it Ubuntu. This has some problems, some of which Matthew Garrett has explored in more details. But generally, imo, it's a useful tool to prevent clueless vps/cloud providers modifying Ubuntu images and breaking them and tarnishing the Ubuntu name (which has happened repeatedly, usually breaking security).