i cannot execute Example B1 in Geant4 iam using Ubuntu 20 :Available UI session types: [ Qt, GAG, tcsh, csh ] qt.qpa.xcb: could not connect to display :0 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, xcb. Aborted (core dumped) #89
Hello! Thanks a lot for the bugreport! Could youl please try the appimage: https://github.com/horsicq/DIE-engine/releases/download/3.08/Detect_It_Easy-3.08-x86_64.AppImage