I recently upgraded to 14.04 from 12.04. doing the correction of audio, I stopped getting the audio icon itself. Now it is not shown from the top right corner(it was being shown when ubuntu instatlled). Also, now I am seeing only 4 icons in All settings window of Ubuntu. Audio setting icon is not there in system settings ( all settings ) window too.
32 Answers
Open unity menu
Go to settings
Select "Sound"
Now check "Show sound volume in the menu bar".
Run this commands in a terminal:
sudo apt-get install --reinstall ubuntu-desktop pulseaudio