I have an SVN server which I use for my personal web development projects. Can I move this to Ubuntu One? Will it be accessible over the intenet? Would I be able to perform the normal SVN operations like
No, you can't.
At some point we thought of adding a WebDAV backend to the file sync service, and that would be a step towards being able to do svn, but it never got much traction.
Why not use launchpad?