Comment 2 for bug 1688508

The script itself is not special to Ubuntu but taken from upstream.

And while I can see a not too complex fix adapting it in a style like "guest_is_on" to return the wanted content in a variable to avoid polluting the result with any output it should be fixed there still.

As far as I was able to check it is still broken the latest master as of today.
Would you mind as being the one who found it to report the issue there and linking the bug or mailing list entry here to help tracking the discussion there?