A few days ago, my system was having audio issues where the sound is too soft/low even at full volume. I discovered I fixed this by installing OSS4. All was right and alright until now, I've found out that there's no audio anymore. No sounds. The volume control has gone. I already installed PulseAudio, pavucontrol, I already removed alsa, but no sound still. When starting a youtube video or video file I can see the volume levels of PulseAudio Volume Control move but there's no sound. I've already checked it's not my headphones and the sound is not muted.
I'm using Lubuntu 16.04 64-bit.