Comment 7 for bug 1689398

Thank you for reporting this bug to Ubuntu.

Ubuntu 17.04 (zesty) reached end-of-life on January 13, 2018.

See this document for currently supported Ubuntu releases:
https://wiki.ubuntu.com/Releases

We appreciate that this bug may be old and you might not be interested in discussing it any more. But if you are then please upgrade to the latest Ubuntu version and re-test. If you then find the bug is still present in the newer Ubuntu version, please add a comment here telling us which new version it is in.

(FYI: Lubuntu hasn't used lightdm in our last six releases, so there is a great chance it no longer applies)