How I've removed the PPA (plus also removed through GUI in system setting/sources)
[~] $ sudo ppa-purge xorg-edgers
Updating packages lists
PPA to be removed: xorg-edgers ppa
Warning: Could not find package list for PPA: xorg-edgers ppa
[~] $ sudo ppa-purge xorg-edgers/ppa
Updating packages lists
PPA to be removed: xorg-edgers/ppa ppa
Warning: Could not find package list for PPA: xorg-edgers/ppa ppa
How I've removed the PPA (plus also removed through GUI in system setting/sources)
[~] $ sudo ppa-purge xorg-edgers
Updating packages lists
PPA to be removed: xorg-edgers ppa
Warning: Could not find package list for PPA: xorg-edgers ppa
[~] $ sudo ppa-purge xorg-edgers/ppa
Updating packages lists
PPA to be removed: xorg-edgers/ppa ppa
Warning: Could not find package list for PPA: xorg-edgers/ppa ppa