To install sound drivers. This is ONLY if needed - Don't fix it if it's not broken! sudo apt-get install dkms sudo add-apt-repository ppa:ubuntu-audio-dev sudo apt-get update sudo... moreTo install sound drivers. This is ONLY if needed - Don't fix it if it's not broken! sudo apt-get install dkms sudo add-apt-repository ppa:ubuntu-audio-dev sudo apt-get update sudo apt-get dist-upgrade sudo apt-get remove --purge alsa-base pulseaudio sudo apt-get install alsa-base pulseaudio sudo alsa force-reload (or just restart to see changes)