One of the things that bugs me a lot about using Ubuntu and all other distros based on it like Pop!_OS is the fact some USB Wi-FI adapters don’t work out of the box, so I’ll share two that work fine with the 17.04 release. Your mileage may vary from distro to distro as in all things GNU/Linux.
First and before all, see if your current adapter isn’t having connection problems because of the
feature bug that keeps changing the MAC address. Developers call it a privacy feature, I call it a Wi-Fi adapter shitstorm from hell that broke stuff.
Please also note that I got BOTH of these adapters to work after disabling that so called privacy feature, follow the link I shared above for directions. You’ll need to use the terminal but it’s easy stuff compared with some other options around.
The first and cheapest 150Mbps adapter that works is the small Robotsky Ralink RT5370, you can get it at various online shops.
The antenna is not removable but it’s fairly small to carry around.
It’s compatible with the IEEE 802.11b/g/n standards, just don’t expect amazing range.
I use it with my netbook, in fact I removed the problematic internal Wi-Fi adapter and now only carry this one with me. Not compatible with Ubuntu 18.10
The second USB adapter I use is the huge 150Mbps Atheros AR9271, search for it online and buy the model in the photo (note the design on the lid). It has the same network specs as the Ralink one but the antenna is removable and it’s huge, I totally recommend this adapter for use with desktops or in areas with bad reception. It’s more expensive than my first option but it’s still worth it.
For now these are the only adapters I use with my Linux distros, if by chance I buy more I’ll add them to this list, but please understand that sometimes factories change the specs and chipset of the adapters. Because mine were bough of ebay I don’t have version numbers to share but it’s better than nothing at all.
All the best and I hope this helps, give a like or comment if it did! I’ll be very happy.