Your previous post said "you can't redistribute Ubuntu binaries or sources as-is, since they contain registered trademarks of Canonical" (emphasis mine), which I think isn't quite true - there has to be some modification involved to fall foul of Ubuntu's IPR.
However, it seems there are plenty of Ubuntu .deb mirrors out there... and there are even instructions at https://help.ubuntu.com/community/Debmirror.
Your previous post said "you can't redistribute Ubuntu binaries or sources as-is, since they contain registered trademarks of Canonical" (emphasis mine), which I think isn't quite true - there has to be some modification involved to fall foul of Ubuntu's IPR.