Autoriser une connection non sécurisée

Créer le fichier:

/etc/apparmor.d/bwrap

et coller:

abi <abi/4.0>,
include <tunables/global>

profile bwrap /usr/bin/bwrap flags=(unconfined) {
  userns,

  # Site-specific additions and overrides. See local/README for details.
  include if exists <local/bwrap>
}  

puis recharger apparmor: sudo systemctl reload apparmor

Note:
https://bugs.launchpad.net/ubuntu/+source/gnome-software/+bug/2061728