Less than two weeks ago, Canonical confirmed What many of us already knew: since GNOME would eliminate X.org sessions on its desktop, Ubuntu would take the final step and do the same by default. Whether you like it or not, it wasn't a surprise. What has been a bit of a surprise is that Kubuntu 25.10 will also no longer support X11 sessions. after a clean install, although some expected it. The fact is that KDE is following a different path than GNOME, and in this case, it's the distributions that are taking the proactive approach.
KDE is considering abandoning X11 in the future, but in the long term, probably when they release Plasma 7, or even before. Currently, taking advantage of the release of plasma 6.4, already offer Wayland and X11 code in separate packages. As we explained, abandoning X11 so soon doesn't address an immediate need, but projects, like Fedora before it, have decided to anticipate the possibility and look to the future.
Kubuntu 25.10 will only support Wayland by default.
The reason given by the Kubuntu developers, who are partly part of KDE, is the same one given by GNOME: to focus their efforts. They feel that, despite attempts to revive X11, which even There is a new fork for you to continue onThe future lies with Wayland, and maintaining X11 only doubles the workload. Opting for a graphics server allows you to focus on the server, work faster, and improve security, among other things.
Furthermore, Rik Mills of KDE says that "It is highly unlikely that we will be able to support X11 session on 26.04 LTS» so it's worth focusing on Wayland. When the time comes, Those who prefer can manually add the X11 session by installing the plasma-session-x11 package, something that can be done with apt.
In my opinion, as a user, I don't think it's a good idea to remove X11 from Kubuntu. Although I use Wayland in KDE, the experience is far from perfect. Qt-based applications and most KDE applications do work well, but GIMP 3, for example, doesn't display its icon in the top bar. These are small inconsistencies that make you feel like you're using something in beta, although many problems are merely aesthetic. Let's hope it improves soon.