@verius By calling something after the original source, they are not misrepresenting the origin of the software.  And even if they are, it is not permitted to use trademarks to restrict the ability of people to modify the software for any reason, including commercial distribution.

I agree that non-onerous trademark compliance requests are reasonable, but I do not think that qualifies in this instance.  If the trademark is that important to a distribution then if they want to be able to ask people to remove the trademarks, they must provide an easy method by which the software can be "white labelled".  There are, actually, instances of free software groups that enforce trademarks and have easy "white labelling" tools, but there is no such method for Ubuntu.