Yup, confirmed ... one more example
plun@plun-laptop:~$ sudo ppa-purge ppa:ubuntu-desktop/gnome3-builds Updating packages lists PPA to be removed: ubuntu-desktop gnome3-builds Warning: Could not find package list for PPA: ubuntu-desktop gnome3-builds
Yup, confirmed ... one more example
plun@plun-laptop:~$ sudo ppa-purge ppa:ubuntu- desktop/ gnome3- builds
Updating packages lists
PPA to be removed: ubuntu-desktop gnome3-builds
Warning: Could not find package list for PPA: ubuntu-desktop gnome3-builds