Ubuntu is an Linux Distro
I'd just like to interject for a moment. What you’re referring to as Linux, is in fact, GNU/Linux, or as I’ve recently taken to calling it, GNU plus Linux. Linux is not an operating system unto itself, but rather another free component of a fully functioning GNU system made useful by the GNU corelibs, shell utilities and vital system components comprising a full OS as defined by POSIX.
[/stallman]
Oh, also, I'm not usually a grammar national socialist, but the correct saying is "Ubuntu is a Linux Distro".