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After installing Torguard on Arch Linux using the PKGBUILD from the downloads section of this site, you may find the UI doesn't open. If you try running sudo /usr/bin/torguard from the command line you might see the following message qt.qpa.plugin: Could not load the Qt platform plugin "xcb" 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: eglfs, linuxfb, minimal, minimalegl, offscreen, vnc, webgl, xcb. /usr/bin/torguard: line 54: 12651 Aborted $SUDO /opt/torguard/bin/torguard Thanks to a tip from the Qt forums https://forum.qt.io/topic/93247/qt-qpa-plugin-could-not-load-the-qt-platform-plugin-xcb-in-even-though-it-was-found/3 I set the QT_DEBUG_PLUGINS=1 # export QT_DEBUG_PLUGINS=1 # . /usr/bin/torguard (Note the period and space before the command to run the command in the current process and pick up the environment variable) [ -- SNIP -- ] "archreq": 0, "className": "QXcbIntegrationPlugin", "debug": false, "version": 330752 } Got keys from plugin meta data ("xcb") QFactoryLoader::QFactoryLoader() checking directory path "/opt/torguard/bin/platforms" ... Cannot load library /opt/torguard/plugins/platforms/libqxcb.so: (libxkbcommon-x11.so.0: cannot open shared object file: No such file or directory) QLibraryPrivate::loadPlugin failed on "/opt/torguard/plugins/platforms/libqxcb.so" : "Cannot load library /opt/torguard/plugins/platforms/libqxcb.so: (libxkbcommon-x11.so.0: cannot open shared object file: No such file or directory)" qt.qpa.plugin: Could not load the Qt platform plugin "xcb" 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: eglfs, linuxfb, minimal, minimalegl, offscreen, vnc, webgl, xcb. Aborted The trace showed clearly that libxkbcommon-x11 was missing, this was easily fixed # pacman -S QT_DEBUG_PLUGINS=1 problem solved, hope this helps someone!