The problem:
Whenever I choose Plasma (Wayland) in SDDM, it stalls for a solid minute and boots me out to the login screen again. I cannot launch KDE Plasma in Wayland, and have determined that this is the cause of the problem:
$ kwin_wayland --xwayland
qt.qpa.plugin: Could not load the Qt platform plugin "wayland-org.kde.kwin.qpa" in "" even though it was found.
This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.
Available platform plugins are: wayland-org.kde.kwin.qpa, dxcb, eglfs, linuxfb, minimal, minimalegl, offscreen, vnc, wayland-egl, wayland, wayland-xcomposite-egl, wayland-xcomposite-glx, xcb, wayland-org.kde.kwin.qpa.
Curiously, wayland-org.kde.kwin.qpa is listed twice in the list of available platform plugins.
I have tried the following:
- Reinstalling
qtwayland5 and qt6-wayland
- This would be if
wayland was not listed in the available platform plugins
- Using the prefix
QT_QPA_PLATFORMS="wayland;wayland-org.kde.kwin.qpa;xcb"
- The list of selected platforms is still
""
- Using a few other XDG variables
System
Distro: Kubuntu 23.04
KDE Plasma: 5.27.6
KDE Frameworks: 5.107.0
Qt Version: 5.15.8
Kernel: 6.2.0-23-generic (64-bit)
Notes
- I am using the
lunar and jammy Ubuntu repositories, as well as the KDE Backports PPA.
- I have an AMD GPU, but no drivers for it installed. Intel Mesa GPU drivers only.
Thanks in advance for anyone trying to help.
