Kijk je bronnenlijst na.
Hoe en waar doet onze Hendrik de Achtste dat?
grep -P '^[ \t]*[^#[ \t]+' /etc/apt/sources.list /etc/apt/sources.list.d/*.list
deb [arch=amd64] (lsb_release -cs) stable
# deb [arch=amd64] (lsb_release -cs) stable
sudo gedit [pad]/sources.list.save