NetworkManager failed to create the device
unknown or unclassified error
the specified connection is not compatible with this device.
invalid argument. Since: 1.16.
the specified connection is not valid
the requested operation could not be completed due to missing dependencies.
the device does not have an active connection
the requested operation is not allowed at this time.
the requested operation is only valid on software devices.
the "specific object" in the activation request (eg, the #NMAccessPoint or #NMWimaxNsp) was not found.
the version id did not match.
Device-related errors.
These errors may be returned directly from #NMDevice methods, or may be returned from D-Bus operations (where they correspond to errors in the "org.freedesktop.NetworkManager.Device" namespace).