I wanted to disable a file in
/etc/apt/sources.list.d. I changed the extension to something else than
.list. It was disabled but I still had a notification
N: Ignoring file 'foo.list_backup' in directory '/etc/apt/sources.list.d/' as it has an invalid filename extension. In man sources.list, I found :
[...] Otherwise APT will print a notice that it has ignored a file, unless that file matches a pattern in the Dir::Ignore-Files-Silently configuration list - in which case it will be silently ignored.
If I do
apt-config dump | grep -i silent, I get a list of patterns but I cannot find those patterns in
grep -i silent /etc/apt/apt.conf -R /etc/apt/apt.conf.d.
Where are "the Dir::Ignore-Files-Silently configuration list" stored ?