If you find that your Headphone is not working in Ubuntu (but performs well in other OS), make sure that your Headphone is OK. And then perform these following tricks in Ubuntu. In the ‘Terminal’ write ‘alsamixer’ to open Alsamixer . In ‘AlsaMixer’ select the <Headphone> column using the side-arrows keys in Keyboard. Now press ‘ m ’ to Unmute the Headphone. ( When the Headphone is mute you can see in the column it shows ‘MM’, and after you unmute the Headphone, it will show ‘00’) Press up-down arrow keys to control volume in your Headphone. Run this command in terminal: sudo alsactl store to store the configuration such that when you open the system again it will boot-up with same config.