You can't do that primarily because nobody would be able to maintain packages for every Linux distribution and every version thereof, due to the enormous amount of work that would entail.
You might be using Ubuntu (or Debian, or some other Debian-based distribution of Linux -- since you're using apt-get as your example, that's obviously Debian-based), but not everyone uses that particular distribution or the same version of that distribution that you do. If someone were to make packages (and it would have to be more than one), they'd realistically need to support at least a few major distros to make it worthwhile (Debian, Ubuntu, Red Hat/CentOS, Fedora, and Arch would probably cover most Linux users these days, I think). Plus multiple different versions/package combinations for each of those. Add to that the time required in testing packages when changes are made. Simply put, it's probably more work than anyone still doing Dreamcast stuff would want to put forth the effort to do.