So I then googled the version `ZLIB_1.2.9' not found (required by /usr/lib/x86_64-linux-gnu/libpng16.so.16)) error and found the solution to that, which solved the problem.įor those who are still stuck after trying every other option out there in the internet, you can look into exact path from which this notorious libqxcb.so is being searched in, for opening/loading by the Qt App( VirtualBox-5.2.8 is the Qt app in my case), using the strace tool. Reinstalling the application may fix this problem. This application failed to start because it could not find or load the Qt platform plugin "xcb".
QLibraryPrivate::loadPlugin failed on "/opt/PostgreSQL/9.6/pgAdmin 4/plugins/platforms/libqxcb.so" : "Cannot load library /opt/PostgreSQL/9.6/pgAdmin 4/plugins/platforms/libqxcb.so: (/opt/PostgreSQL/9.6/lib/libz.so.1: version `ZLIB_1.2.9' not found (required by /usr/lib/x86_64-linux-gnu/libpng16.so.16))" Loaded library "/opt/PostgreSQL/9.6/pgAdmin 4/plugins/platforms/libqxcb.so"
My output after turning on QT_DEBUG_PLUGINS was: QFactoryLoader::QFactoryLoader() checking directory path "/opt/PostgreSQL/9.6/pgAdmin 4/bin/platforms". Read the actual error message thrown by QT, since none of the above solutions addressed the cause of this error in my case. To any future readers who come across this - before you start (dangerously) messing around with symlinks to shared libraries, I strongly suggest that you runĪnd then run your failing executable again in the Terminal.
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