Got my other 18.04 issue (netatalk) solved by following compile/make/install instructions for 16.10 (apparently 16.04 is too old, go figure). Yay me. :-O~~~
We're watching the "directors cut extended version", which has discarded scenes restored from assorted damaged/unfinished takes. A bit jarring but the story has continuity.
“Reptilians Rule the World, Moon Landing Was Fake”
SSD prices have been crashing over the last few weeks, you should absolutely get one as your main system drive. There is no other upgrade comparable to the speed increase you'll get with an SSD.
No, I don't game on Linux... haven't really had any problems with free radeon drivers in the past though I understand some of the latest gpus aren't well supported, pretty sure the R7 is ok.
“Reptilians Rule the World, Moon Landing Was Fake”
I agree with Ant. If you're struggling to afford it, personally I'd drop the RAM to 8GB (tbh) and go for an SSD. RAM is easy to upgrade in the future, and you'll get a faster and more responsive system in general out of an SSD/8GB RAM than you will from a mechanical HDD and 16GB RAM.