Thank you for reporting this bug to Ubuntu.
Ubuntu GNOME 16.04 (xenial) reached end-of-life in April 2019.
https://ubuntugnome.org/ubuntu-gnome-16-04-lts-is-here/
https://wiki.ubuntu.com/XenialXerus/ReleaseNotes/UbuntuGNOME
We appreciate that this bug may be old and you might not be interested
Hmm, it's in a special section for Settings. Which requires pressing
Down then Right then Enter. It should just be Enter, because it's the
most relevant action.
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