Hello,
Using Synaptic I installed pulseaudio and pavucontrol.  Running the
latter in a terminal produces these messages:

    ** (pavucontrol:4086): WARNING **: Error retrieving accessibility
bus address: org.freedesktop.DBus.Error.ServiceUnknown: The name
org.a11y.Bus was not provided by any .service files
    /usr/bin/pulseaudio: symbol lookup error: /usr/bin/pulseaudio:
undefined symbol: pa_dbus_connection_unref

Running Skype in a terminal also produces the second line above.
Skype and the Flash player do not play any sound.  And the Control
Centre shows no reference to pulseaudio.
Any ideas on how to make it available?
Robert