Edit: /usr/share/appstream/appstream.conf (370B)
#
# This file contains distribution-specific configuration for AppStream.
# If data for your distribution is missing, you can submit
# a patch to include it upstream.
# The distribution identifier from /etc/os-release is used as key.
#
[general]
#
# Distribution specific settings
#
[debian]
FreeRepos=debian-*-main
[ubuntu]
FreeRepos=ubuntu-*-main;ubuntu-*-universe