[kde] [Bug 479662] New: Cannot launch Plasma in Wayland

[bug-control at kde.org]

https://bugs.kde.org/show_bug.cgi?id=479662

            Bug ID: 479662
           Summary: Cannot launch Plasma in Wayland
    Classification: I don't know
           Product: kde
           Version: unspecified
          Platform: Ubuntu
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: unassigned-bugs at kde.org
          Reporter: danielpetrov at outlook.com
  Target Milestone: ---

SUMMARY
***
NOTE: If you are reporting a crash, please try to attach a backtrace with debug
symbols.
See
https://community.kde.org/Guidelines_and_HOWTOs/Debugging/How_to_create_useful_crash_reports
***

I am completely unable to launch plasma in wayland, and I am completely lost at
this point.

Steps I have tried:
1. Specify `QT_QPA_PLUGIN="xcb;wayland-org.kde.kwin.qpa"` in `/etc/environment`
2. Reinstall `qtwayland5`, `qt6-wayland`
3. Install every possible platform plugin for qt (which is probably how I ended
up with wayland-org.kde.kwin.qpa)
4. Reinstall kwin

Nothing seems to work. However, upon specifying `QT_DEBUG_PLUGINS=1` in
`/etc/environment`, I found this:
```
Jan 11 12:07:39 prizm kwin_wayland_wrapper[59248]:
QFactoryLoader::QFactoryLoader() checking directory path "/usr/bin/platforms"
...
Jan 11 12:07:39 prizm kwin_wayland_wrapper[59248]: Cannot load library
/usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/KWinQpaPlugin.so:
(/usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/KWinQpaPlugin.so: undefined
symbol: _ZN15QPlatformWindow17startSystemResizeERK6QPointN2Qt6CornerE, version
Qt_5_PRIVATE_API)
Jan 11 12:07:39 prizm kwin_wayland_wrapper[59248]: QLibraryPrivate::loadPlugin
failed on "/usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/KWinQpaPlugin.so" :
"Cannot load library
/usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/KWinQpaPlugin.so:
(/usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/KWinQpaPlugin.so: undefined
symbol: _ZN15QPlatformWindow17startSystemResizeERK6QPointN2Qt6CornerE, version
Qt_5_PRIVATE_API)"
Jan 11 12:07:39 prizm kwin_wayland_wrapper[59248]: qt.qpa.plugin: Could not
load the Qt platform plugin "wayland-org.kde.kwin.qpa" in "" even though it was
found.
Jan 11 12:07:39 prizm kwin_wayland_wrapper[59248]: This application failed to
start because no Qt platform plugin could be initialized. Reinstalling the
application may fix this problem.
Jan 11 12:07:39 prizm kwin_wayland_wrapper[59248]: 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.
```
Whatever it is, the issue seems to be wayland-org.kde.kwin.qpa. I can't find
the package that this is from, so I was curious if anyone could lend a hand.

SOFTWARE/OS VERSIONS
Linux: Kubuntu 23.10
KDE Plasma Version: 5.27.10
KDE Frameworks Version: 5.112.0
Qt Version: 5.15.10
Kernel: 6.5.0-14-generic (64-bit)

ADDITIONAL INFORMATION
<!!!> I also have the KDE Backports PPA, which allows me to keep my KDE suite
up to date. I suspect this may be a reason I am having this problem, and should
probably create a fresh install come Plasma 6.

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