Here I ask this question since Beta 2 is usable and this question would come up sooner then later ;) After issuing the standard

sudo add-apt-repository ppa:matthaeus123/mrw-gimp-svn
sudo apt-get update

I get

 W: Failed to fetch http://ppa.launchpad.net/matthaeus123/mrw-gimp-svn/ubuntu/dists/precise/main/source/Sources  404  Not Found

    W: Failed to fetch http://ppa.launchpad.net/matthaeus123/mrw-gimp-svn/ubuntu/dists/precise/main/binary-amd64/Packages  404  Not Found

    W: Failed to fetch http://ppa.launchpad.net/matthaeus123/mrw-gimp-svn/ubuntu/dists

/precise/main/binary-i386/Packages  404  Not Found

E: Some index files failed to download. They have been ignored, or old ones used instead.

Is there any way to get around this. Excluding compiling from source as it usually introduces even more multilevel errors.