I've found this fix works for me, can someone explain why?

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  • OpenMandriva Lx version:
    Rome

  • Desktop environment (KDE, LXQT…):
    Wayland KDE

  • Description of the issue (screenshots if relevant):
    Certain QT flatpaks (masterpdfeditor) were displaying

Failed to create wl_display (No such file or directory)
qt.qpa.wayland: Failed to initialize EGL display 3001
qt.qpa.plugin: Could not load the Qt platform plugin “wayland-egl” 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.

  • Relevant informations (hardware involved, software version, logs or output…):
    Solved by adding export QT_QPA_PLATFORM=xcb to ~/.config/plasma-workspace/env/exports.sh
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Software probably doesn’t work well under Wayland. xcb reverts back to X11. I use it too.

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When I was playing with KDE on Wayland last night I was running into apps not launching like that. I got around it by installing “qt5-qtwayland” and “qt6-qtwayland”.

Apparently those packages are needed to have QT5 and QT6 apps to interface properly, the app in question that was not launching for me until after I installed was dnfdrake.

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@seth_reee thanks for chiming in and welcome to OpenMandriva!

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Welcome! We are glad to see you here.

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This typically means it was not built with Qt6.

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I encountered this too. I needed to install them to run Raspberry Pi Imager.