the sound-volume indicator disappeard Ubuntu 13.10

Try to re-configure it if already installed

Open terminal and execute these commands:

sudo dpkg-reconfigure $(dpkg -l | grep indicator-sound | awk '{print $2}' | tr '\n' ' ')
sudo update-initramfs -u

If above doesn't help then try to re-install indicator-sound by executing this command:

sudo apt-get -f install --reinstall indicator-sound indicator-sound-gtk2

Again logout/restart your system.

Reply if you get any error at any particular command with the error message.

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