I came across a user account bearing the name of one of the Ubuntu flavours. I was not aware of Xubuntu operating its own team account and this one uses the flavour's name. I've pinged the team in its IRC channel to ask if this is something they're operating but this may be a trademarks infringement against Canonical if not connected to the development team.
Possible copyright or trademark infringements should be brought to the attention of the copyright or trademark holder.
It then becomes their problem to deal with how they see fit.
If they want the offending post, image, username or whatever removed then they can contact Stack Exchange.
It's not our place, as users or moderators, to police this.