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Canonical's Steam Snap is Causing Headaches for Valve
(www.omgubuntu.co.uk)
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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.
Community icon by Alpár-Etele Méder, licensed under CC BY 3.0
The "Discover" app from KDE and the "Software" app from GNOME actually support backend plugins, but it's far from ideal. I had an issue where a Flatpak (Tor Launcher) showed up in Discover with an update available, but when trying to update it would fail silently and show up as an update again. Updating via CLI revealed that the package was deprecated in favor of another one and it asked whether I wanted to replace it.
Even if it'd work great, it wouldn't really solve the issue that developers have to try and package their app in many different formats because not all distributions support all formats (out of the box). There isn't a clear "release in this format" for developers. And as I said, unofficial packages aren't ideal.
Refer to the xkcd. There's never going to be a single universal standard to unite them all and in light bind them. The best you're going to get is improved support and integration.