When I try and do the following, this is what I get. I found the ppa by using this: cat /etc/apt/sources.list; for X in /etc/apt/sources.list.d/*; do echo; echo; echo "** $X:"; echo; cat $X; done (text file is attached) zookeeper@zookeeper-MS-7737:~$ sudo ppa-purge ppa:ricotz-testing-quantal Updating packages lists W: GPG error: http://ppa.launchpad.net quantal Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY B2DFD25316B94077 W: GPG error: http://ppa.launchpad.net quantal Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 5FFFCB6756E761C2 PPA to be removed: ppa:ricotz-testing-quantal ppa:ricotz-testing-quantal Warning: Could not find package list for PPA: ppa:ricotz-testing-quantal ppa:ricotz-testing-quantal ** /etc/apt/sources.list.d/cardapio-team-cardapio-ppa-quantal.list: deb http://ppa.launchpad.net/cardapio-team/cardapio-ppa/ubuntu quantal main deb-src http://ppa.launchpad.net/cardapio-team/cardapio-ppa/ubuntu quantal main ** /etc/apt/sources.list.d/cardapio-team-cardapio-ppa-quantal.list.distUpgrade: deb http://ppa.launchpad.net/cardapio-team/cardapio-ppa/ubuntu quantal main deb-src http://ppa.launchpad.net/cardapio-team/cardapio-ppa/ubuntu quantal main ** /etc/apt/sources.list.d/cardapio-team-cardapio-ppa-quantal.list.save: deb http://ppa.launchpad.net/cardapio-team/cardapio-ppa/ubuntu quantal main # deb-src http://ppa.launchpad.net/cardapio-team/cardapio-ppa/ubuntu quantal main ** /etc/apt/sources.list.d/cardapio-team-cardapio-ppa-raring.list: ** /etc/apt/sources.list.d/cardapio-team-cardapio-ppa-raring.list.save: ** /etc/apt/sources.list.d/dropbox.list: deb http://linux.dropbox.com/ubuntu precise main ** /etc/apt/sources.list.d/dropbox.list.distUpgrade: deb http://linux.dropbox.com/ubuntu precise main ** /etc/apt/sources.list.d/dropbox.list.save: deb http://linux.dropbox.com/ubuntu precise main ** /etc/apt/sources.list.d/gnome3-team-gnome3-quantal.list: ** /etc/apt/sources.list.d/gnome3-team-gnome3-quantal.list.distUpgrade: ** /etc/apt/sources.list.d/gnome3-team-gnome3-quantal.list.save: ** /etc/apt/sources.list.d/gnome-shell-extensions-ppa-quantal.list: deb http://ppa.launchpad.net/gnome-shell-extensions/ppa/ubuntu quantal main deb-src http://ppa.launchpad.net/gnome-shell-extensions/ppa/ubuntu quantal main ** /etc/apt/sources.list.d/gnome-shell-extensions-ppa-quantal.list.distUpgrade: deb http://ppa.launchpad.net/gnome-shell-extensions/ppa/ubuntu quantal main deb-src http://ppa.launchpad.net/gnome-shell-extensions/ppa/ubuntu quantal main ** /etc/apt/sources.list.d/gnome-shell-extensions-ppa-quantal.list.save: deb http://ppa.launchpad.net/gnome-shell-extensions/ppa/ubuntu quantal main deb-src http://ppa.launchpad.net/gnome-shell-extensions/ppa/ubuntu quantal main ** /etc/apt/sources.list.d/gwibber-daily-ppa-quantal.list: ** /etc/apt/sources.list.d/gwibber-daily-ppa-quantal.list.distUpgrade: ** /etc/apt/sources.list.d/gwibber-daily-ppa-quantal.list.save: ** /etc/apt/sources.list.d/noobslab-noobslab-conky-raring.list: deb http://ppa.launchpad.net/noobslab/noobslab-conky/ubuntu raring main deb-src http://ppa.launchpad.net/noobslab/noobslab-conky/ubuntu raring main ** /etc/apt/sources.list.d/noobslab-noobslab-conky-raring.list.distUpgrade: deb http://ppa.launchpad.net/noobslab/noobslab-conky/ubuntu raring main deb-src http://ppa.launchpad.net/noobslab/noobslab-conky/ubuntu raring main ** /etc/apt/sources.list.d/noobslab-noobslab-conky-raring.list.save: deb http://ppa.launchpad.net/noobslab/noobslab-conky/ubuntu raring main deb-src http://ppa.launchpad.net/noobslab/noobslab-conky/ubuntu raring main ** /etc/apt/sources.list.d/ricotz-testing-quantal.list: ** /etc/apt/sources.list.d/ricotz-testing-quantal.list.distUpgrade: ** /etc/apt/sources.list.d/ricotz-testing-quantal.list.save: ** /etc/apt/sources.list.d/satyajit-happy-themes-raring.list: deb http://ppa.launchpad.net/satyajit-happy/themes/ubuntu raring main ** /etc/apt/sources.list.d/satyajit-happy-themes-raring.list.distUpgrade: deb http://ppa.launchpad.net/satyajit-happy/themes/ubuntu raring main ** /etc/apt/sources.list.d/satyajit-happy-themes-raring.list.save: deb http://ppa.launchpad.net/satyajit-happy/themes/ubuntu raring main ** /etc/apt/sources.list.d/screenlets-ppa-quantal.list: ** /etc/apt/sources.list.d/screenlets-ppa-quantal.list.distUpgrade: ** /etc/apt/sources.list.d/screenlets-ppa-quantal.list.save: ** /etc/apt/sources.list.d/screenlets-ppa-raring.list: ** /etc/apt/sources.list.d/screenlets-ppa-raring.list.save: ** /etc/apt/sources.list.d/ubuntu-wine-ppa-quantal.list: ** /etc/apt/sources.list.d/ubuntu-wine-ppa-quantal.list.distUpgrade: ** /etc/apt/sources.list.d/ubuntu-wine-ppa-quantal.list.save: ** /etc/apt/sources.list.d/upubuntu-com-gtk3-quantal.list: ** /etc/apt/sources.list.d/upubuntu-com-gtk3-quantal.list.distUpgrade: ** /etc/apt/sources.list.d/upubuntu-com-gtk3-quantal.list.save: