remove：
Run Ubuntu Software Center and from the menu choose "Software Sources" - there you can add/edit/remove repositories. Since Ubuntu Maverick (10.10) add-apt-repository accepts a -r or --remove parameter which removes the PPA in the same way you installed it. :) "sudo apt-key del id" where is looks like 7FAC5991.Jul 29, 2010
add:
$ sudo add-apt-repository ppa:wiznote-team
$ sudo apt-get update
$ sudo apt-get install wiznote
