Today my Ubuntu Update manager complaint:

W:Failed to fetch http://ppa.launchpad.net/sunab/kdenlive ... 4/Packages 404 Not Found
, W:Failed to fetch http://ppa.launchpad.net/sunab/kdenlive ... 6/Packages 404 Not Found
, E:Some index files failed to download. They have been ignored, or old ones used instead.

Has the ppa settings changed?

bye

Ronald

Hmm. Well https://launchpad.net/~sunab/+archive/kdenlive-release does not have saucy packages if you look there now.
I don't know if they were there before. You could ask sunab https://launchpad.net/~sunab

The bleeding edge ppa https://launchpad.net/~sunab/+archive/kdenlive-svn does have saucy.

But I would warn you that for me the bleeding edge do not work I get "Initialization of OpenGL filters failed. Exiting " bug.