I know it's a stupid answer but did you check if your speakers or headphones were connected correctly and if you have drivers for them if you need them. That happened to me last time I reinstalled my OS. Good luck
Sound drivers need to be installed bro . http://askubuntu.com/questions/774458/installed-lubuntu-16-04-version-no-audio-now
I have already done done that still no audio this is my first time trying linux since windows is now are using force updates
Do you update your ubuntu package? Most of time it's solve the problem. If it's not try ask on Ubuntu forum. Oh by the way try https://manjaro.github.io/Manjaro-Lxqt-dark-16.04-released/ I have use it and have no problem since.. never reinstalling.
Lol, I had trouble accessing my Ubuntu partition(bios bootloader) all day. Finally managed to get a start on my assignment. Glad to know , there are fellow Ubuntu stragglers here.