com.canonical.indicator.sound visible key is gone

Question

I was missing the sound indicator from the xfce4 unity notification indicator panel, so I tried the steps in Sound icon missing from top menu to fix it.

I discovered that com.canonical.indicator.sound visible is literally gone. How do I add it back?

Answer 1

It turns out that the indicator-sound package was missing. This probably occurred as a result of purging pulseaudio to fix its issues. Reinstalling it immediately made it available.