I'm the maintainer of that ubuntu PPA, sorry you're having trouble with it. I think maybe all you need to do is to run 'sudo add-apt-repository ppa:kuhlen/ppa'. Note the trailing '/ppa'. Can you give that a try?
Otherwise, can you look under /etc/apt/sources.list.d/ and see if there's a file named 'kuhlen-ppa-precise.list'? If there is, what is its content?
I've been a bit remiss in keeping these packages up-to-date, but spurned by your email I just re-packaged updates to the most recent versions (yt: 329d11eeff22, yt-devel: 09a0fd75818b). Should be available there some time tomorrow.