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7 years later, Valve's Proton has been an incredible game-changer for Linux
(www.gamingonlinux.com)
This is a most excellent place for technology news and articles.
One thing you might notice is that flatpak defaults to "system" installs. Is your root system directory filling up? You probably want to start installing onto --user, as this will put things in /home where they belong and, by default, sandbox permissions away from root (that, too, can be easily changed).
Also, don't fear mixing different ways of installing. I use AppImage, Flatpak, the default app-get install method, and .deb. FlatPak at this point is the best, because it offers the ease of use of AppImage, but the flexibility and auto-maintenance of apt-get/Software Update. The only problems I've encountered were due to me not understanding that it was filling up my root partition by default...
I've been running Mint MATE for about 9 years. Love it to death.
Recommending the —user flag is good advice and isn’t intuitive!