An Azure service that is used to provision Windows and Linux virtual machines.
The easiest way to double-check audio is installed is heading to the Volume Control applet PulseAudio Volume Control in GNOME or searching PulseAudio in the Search pane.
If pulseaudio is installed, you will need the pulseaudio-utils package as well.
Finally, double-check that there is a config file in your home directory by looking for .pulseaudio either in the terminal or in a file browser.
Invoking pulseaudio --start will make start the service. pulseaudio --status should also show no output if everything is ok.