Xubuntu - Fix the QT_QPA_PLATFORMTHEME environment variable is not set correctly error
A short while back, I upgraded the minimal installation of Xubuntu Jammy Jellyfish to Noble Numbat, and then I installed Qt5 Configuration Utility (qt5ct) and upon launching, it presented me with the following error,
the QT_QPA_PLATFORMTHEME environment variable is not set correctly (current value:gtk2, required value:qt5ct)
So, I added the following line into the /etc/environment file,
export QT_QPA_PLATFORMTHEME=qt5ct
Next I performed the logout/login routine and again launched the qt5ct and again the same error persisted to my frustration.
A slight digging in the internet dirt made me realize that in the /etc/X11/Xsession.d/56xubuntu-session file, there is a line,
export export QT_QPA_PLATFORMTHEME=gtk2
And, that very line is the reason for the whole issue. The solution is simple; just change that line above to,
export QT_QPA_PLATFORMTHEME=qt5ct
And we are done with it. Do the logout/login thing and this time the qt5ct should launch without any errors, and you should be able to theme your QT based applications.
Adios for now.
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