I wanted to try out oss because sound on alsa is not great. I am on elementaryOS Loki which is built on ubuntu.

Anyways I installed alsa-oss using sudo apt-get install alsa-oss but it didn't recognize my sound card(its Realtek ac290). So I uninstalled it and now I dont have any sound. I have tried reinstalling alsa using

 sudo aptitude --purge reinstall linux-sound-base alsa-base alsa-utils linux-image-`uname -r` linux-ubuntu-modules-`uname -r` libasound2

but this doesnt fix anything, still no sound. When I type alsamixer in terminal I get :cannot open mixer: No such file or directory Please help!

sudo apt-get install --reinstall linux-image-extra-$(uname -r)

This command reinstalled all the missing drivers and fixed the problem. I will just leave it here so that it can help others in future.

Source: https://askubuntu.com/questions/940091/ubuntu-16-04-reinstall-all-drivers

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