Cinelarra has two versions: the unsupported community version and a commercial edition. Every six months the nice Cinelarra developers release the latest source code. It’s not widely available in the usual distro repositories, but the good Cinelerra-CV folks bundle it up into Arch, Debian, Fedora, Ubuntu, and other distro packages. There is a Cinelarra PPA— Personal Package Archive– for Ubuntu users. PPAs are user-supported repositories for specific applications, like Cinelarra. They’re not official repos, but they allow you to use your normal Ubuntu package manager to install and remove third-party software.
Also, one of the thing I love from Linux is the variety in the distros. What’s the problem with that? Canonical is doing a great effort to come to home users, more than RedHat or Novell… use then a Debian-based distro like ubuntu, but let us the rest of the people with our distros, with our beloved desktop or window manager… anyway, it doesn’t affect to aplications since we all can compile from source (at least in my case, because I use gentoo and I must always compile from sources), and you can find binaries for debian-based or rpm-based distros.