adicionar, remover e listar ppas

para adicionar ppa

# add-apt-repository ppa:PPA_NAME/PROGRAM
# apt-get update

listar

# grep ^ /etc/apt/sources.list /etc/apt/sources.list.d/*

ou 

# apt policy 

ou

 grep -E '^deb\s' /etc/apt/sources.list /etc/apt/sources.list.d/*.list |\
  cut -f2- -d: |\
  cut -f2 -d' ' |\
  sed -re 's#http://ppa\.launchpad\.net/([^/]+)/([^/]+)(.*?)$#ppa:\1/\2#g' |\
  grep '^ppa:'

remover

add-apt-repository --remove ppa:PPA_NAME/PROGRAM

ou

# ls /etc/apt/sources.list.d

#sudo rm -r /etc/apt/sources.list.d/PPA_Name.list