Dear Maintainer,
After upgrading libnm-glib4 to Testing version NetworkManager will no longer
connect, disconnect, or manage connections.
No network devices available is the only option that is available from the left-click menu. I tried this previously before upgrading some related system components:
(gnome-keyring, console-kit)
and had approximately the same issue but the error message was one about
insufficient authorization. The system is still connected however as it was
before the upgrade, so the ability of the system to connect has not changed.