X11 has been, and still is, a vital piece of technology at the core of professional Unix-like workstations since decades. It has a proven track record of supporting enterprise-grade applications with long-term protocol stability and platform compatibility. It has matured over decades. XLibre is an actively developed fork of the X.Org X11 server, initiated by the most active X.Org developer and supported by the open source community.
An incompatible alternative, Wayland, is being aggressively pushed by IBM = Red Hat = Gnome = Fedora = freedesktop.org. However, it is not ready to succeed X11 as it its governance model leads to never-ending discussions and prevents even the most essential functionality from existing. Think twice before abandoning Xorg. Wayland breaks everything!
It is time that the open source community reclaims what was ours to begin with. This page lists distributions supporting XLibre so that you can make an informed choice.
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UNIX has never been that simple. Distributions have always made their own packaging decisions. That’s why applications are distributed from upstream, so they can be built locally to conform to however that local install needs to be done.
That’s why applications being said, that is also the reason there are solutions like flatpak and app images; to reduce fragmentation and provide a just works solution. However, app images and don’t work for those solutions, as you already know. While it would be best to get the down stream, there are ways around this with PPAS, Copr, AUR, SuSE obs, and others. We don’t need to be in the distro to be in the distro. If they don’t want officially be in, fine. There are ways around it, while still being able to have a presence in the distro. It just means we’d have to find volunteers that would be willing to package it.