Package: libvirt-daemon-config-nwfilter Version: 9.0.0-4 I installed this package by mistake, by installing virt-manager with recommends... so i purged virt-manager (and dependencies) to then reinstall it.
... and noticed the following warning: Purging configuration files for libvirt-daemon-config-nwfilter (9.0.0-4) ... dpkg: warning: while removing libvirt-daemon-config-nwfilter, directory '/etc/libvirt' not empty so not removed O.o ... think that there is no need for the '/etc/libvirt' not empty, since it only contains another empty directory inside: /etc/libvirt/secrets/ ps: similar happens to libvirt-daemon-system, for which i will also fill a bug report.