carmelo@carmelo-HP-250-G3-Notebook-PC:~$  sudo ppa-purge ppa:fossfreedom/rhythmbox-plugins 
[sudo] password di carmelo: 
Updating packages lists
PPA to be removed: fossfreedom rhythmbox-plugins
Warning:  Could not find package list for PPA: fossfreedom rhythmbox-plugins
carmelo@carmelo-HP-250-G3-Notebook-PC:~$