Adds PAVU.

install_ubuntu_details.sh

@@ -657,6 +657,10 @@ systemctl --user --now enable pipewire pipewire-pulse
 # Enable Pipewire media session
 systemctl --user --now enable pipewire-media-session.service
 
+# If no Desktop Audio, install PAVU.
+# https://obsproject.com/forum/threads/no-desktop-audio-ubuntu-20-10.140429/
+sudo apt install pavucontrol
+
 #-----------------------------------------------------------------------
 # Homebrew and Hugo.