I observe that removing a ppa with Software & Updates or with :
sudo add-apt-repository --remove ppa:xxx/yyy
merely empties the file one wants to remove and leaves an empty theuglyppa.list file in
(same with ppa-purge) Why is this ? This seem quite illogical to keep such residue especially for newbies who won't know that they should add :
sudo rm /etc/apt/sources.list.d/theuglyppa.list*
to their cleaning procedure. Where should this odd behaviour be reported as a bug ? As I consider this as a bug, unless somebody tells me what brilliant logic justifies such leftovers.