upgraded to linux kernel 4.8

I upgraded my Linux Mint 18.1 to the 4.8 kernel and was left without network and sound. To fix that all I needed to do was to install the linux-image-extra, which I don't remember ever needing to install explicitly:


sudo apt-get install linux-image-extra-4.8.0-52-generic


Saving here because it took me a couple of hours until I got to this solution.