Merge branch 'upgrade' into 'master'

root.sh: Perform dist-upgrade with the added apt repos

See merge request !183

root.sh

@@ -318,6 +318,8 @@ function install_pkgs()
         # shellcheck disable=SC2086
         chroot "${basedir}" apt -y -o Debug::pkgProblemResolver=yes install -y --simulate ${packages}
     fi
+    # Get the updates from additional repositories
+    chroot "${basedir}" apt-get -y dist-upgrade
 }