Hi,
firstly, you do not have to go on about free or a paid OS or other things unrelated, please stay on topic when replying. 
If 16.04 isn't working for you, try 17.10, 18.04 is in Beta but works, you could also try that and see what the results are.
You can keep your data intact if you have a separate root and home partition by following this guide:
I don't know where you got this idea from?. 