Note to anyone thinking of installing Linux: we recently got a new HP laptop 360. The WIFI does not work on it. Supposedly there is a fix, which, which I will try when my USB ethernet adapter arrives, and I can be online during the install (so far I have only tried it as a live version). I have tried several Linux distributions, and all had no wireless. So, best to avoid HP laptops if you plan to install Linux. Newer ones at any rate; old ones probably work fine. It is worth your while to research thoroughly what new machines work well with Linux. I don't want to discourage anyone; most brands probably are fine. but some may have problems, so do your homework!
I bought a new mini PC a few months ago and the Wifi didn't work at first (began with Linux Mint - 19.1 at first, and now using Linux Mint 19.2). The wireless card is: Realtek RTL8111/8168/8411 PCI Express Gigabit Ethernet
I ended up removing some things from Startup, and between that and waiting about 5-10 extra seconds before putting in my password to decrypt the drive and then also when logging in... the network card started connecting. I'm not sure exactly what's going on with that. (I only did all that on a hunch that it somehow was too busy with other processes at startup and wasn't getting around to starting up the wireless card.)
I originally was afraid it was never going to connect. I restarted it
many times and the wifi was not working at all and just said the cable was unplugged.
The even weirder thing is that the problem reoccurs every time I upgrade to a new kernel - after which, for the first startup, even with the same accommodations above, the wifi still fails to start up that first time.
I have to shut it down and then turn it on and take my time logging in my passwords... after which it always connects, and continues to always connect after that very reliably. In fact it's even more reliable than my wifi on my Windows 7 laptop which has to be reset all the time. After I get it to connect that first time after a new install or new kernel, the Linux Mint wifi is incredibly solid and also a lot faster than my Windows 7 laptop.
Here are some suggestions that somebody recommended - I only did the first one, but perhaps you might find it helpful:
Easy Linux Tips Project: How to solve internet connection problems
I hope you get your wifi to work. That was the only issue I've had in switching to Linux Mint, which has been incredibly stable, reliable, and easy to use. I hate having to use my Windows 7 laptop at this point.