Hello everyone, me again! I finally built my QT5 application for Udoobuntu 2 (I know there is not so much source around for that. So I can help anyone with that.). My application is a basic Video Player application which depends on Qmediaplayer. When I run glmark2 or something else that tests OpenGL ES2, it works without problems. But when I run my application or any QT application uses OpenGL (as hellogl_es2), It gives the error following, "Unable to find an X11 visual which matches EGL config". Full output; Code: root@udooneo:/usr/lib/arm-linux-gnueabihf/qt5/examples/opengl/hellogl_es2# ./hellogl_es2 xkbcommon: ERROR: x11: failed to get keymap from X server: unmet condition in get_explicits(): wire->keycode >= keymap->min_key_code && wire->keycode <= keymap->max_key_code Warning: EGL suggested using X Visual ID 33 (RGB565) for EGL config 5 (RGB444), but this is incompatable Unable to find an X11 visual which matches EGL config 5 Warning: EGL suggested using X Visual ID 33 (RGB565) for EGL config 1 (RGB444), but this is incompatable Unable to find an X11 visual which matches EGL config 1 Warning: EGL suggested using X Visual ID 33 (RGB565) for EGL config 1 (RGB444), but this is incompatable Unable to find an X11 visual which matches EGL config 1 Warning: EGL suggested using X Visual ID 33 (RGB565) for EGL config 1 (RGB444), but this is incompatable Unable to find an X11 visual which matches EGL config 1 Warning: EGL suggested using X Visual ID 33 (RGB565) for EGL config 1 (RGB444), but this is incompatable Unable to find an X11 visual which matches EGL config 1 Warning: EGL suggested using X Visual ID 33 (RGB565) for EGL config 1 (RGB444), but this is incompatable Unable to find an X11 visual which matches EGL config 1 Warning: EGL suggested using X Visual ID 33 (RGB565) for EGL config 1 (RGB444), but this is incompatable Unable to find an X11 visual which matches EGL config 1 Segmentation fault