If suddenly you have no sound on your ubuntu system, you should try this:
$ pulseaudio -k && sudo alsa force-reload
Also this should work:
$ killall pulseaudio
PHP, Json, jQuery, MySQL, Memcahe, REDIS, Symfony, Android, Nginx, NodeJS, Phalcon PHP, Python, Django, Flask, ReactJS, ReactNative, ElasticSearch, AWS
If suddenly you have no sound on your ubuntu system, you should try this:
$ pulseaudio -k && sudo alsa force-reload
Also this should work:
$ killall pulseaudio