Very odd... There is nothing special about this config file (it's installed like every other) and this works absolutely fine on Debian and even my Ubuntu VM. So, something very odd and possibly uBUNTU-SPECIFIC is going on here...
-- You received this bug notification because you are a member of Desktop Packages, which is subscribed to appstream in Ubuntu. https://bugs.launchpad.net/bugs/1983112 Title: Appstream does not install config file Status in appstream package in Ubuntu: New Bug description: After performing an Ubuntu automated server install, and installing the ubuntu-desktop-minimal package (which includes appstream as a dependency) then the snap-store, the snap-store will fail to display search results for .deb packages in the Ubuntu apt repositories. This is due to a missing config file (/etc/apt/apt.conf.d/50appstream) which is supposed to be installed as part of the appstream package. The issue can be fixed by re-installing appstream with the following command-line: apt-get -y install --reinstall -o Dpkg::Options::="--force-confmiss" appstream ProblemType: Bug DistroRelease: Ubuntu 22.04 Package: appstream 0.15.2-2 ProcVersionSignature: Ubuntu 5.15.0-41.44-generic 5.15.39 Uname: Linux 5.15.0-41-generic x86_64 ApportVersion: 2.20.11-0ubuntu82.1 Architecture: amd64 CasperMD5CheckMismatches: ./boot/grub/grub.cfg CasperMD5CheckResult: fail CurrentDesktop: ubuntu:GNOME Date: Fri Jul 29 15:25:44 2022 InstallationDate: Installed on 2022-07-27 (1 days ago) InstallationMedia: Ubuntu-Server 22.04 LTS "Jammy Jellyfish" - Release amd64 (20220421) ProcEnviron: TERM=xterm-256color PATH=(custom, no user) XDG_RUNTIME_DIR=<set> LANG=en_GB.UTF-8 SHELL=/bin/bash SourcePackage: appstream UpgradeStatus: No upgrade log present (probably fresh install) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/appstream/+bug/1983112/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp

