I asked the question in stack owerflow before but I guess my problem is at first a ubuntu problem. When I excute a kivy script (e.g. hello world) in a vitualenv the script runs without errors but I see no open window only a Python icon in the task bar and it is am not possible top open window. I will attached the terminal output and the icon. I guess there is a problem with configuration: Can I get a tip on how solve the problem?
[INFO ] [Logger ] Record log in /home/claus/.kivy/logs/kivy_22-02-18_1.txt [INFO ] [Kivy ] v2.0.0 [INFO ] [Kivy ] Installed at "/home/claus/Python_Programm/Python_Ingo/kivy_venv/lib/python3.8/site-packages/kivy/__init__.py" [INFO ] [Python ] v3.8.10 (default, Nov 26 2021, 20:14:08) [GCC 9.3.0] [INFO ] [Python ] Interpreter at "/home/claus/Python_Programm/Python_Ingo/kivy_venv/bin/python3" [INFO ] [Factory ] 186 symbols loaded [INFO ] [Image ] Providers: img_tex, img_dds, img_sdl2, img_pil (img_ffpyplayer ignored) [INFO ] [Text ] Provider: sdl2 [INFO ] [Window ] Provider: sdl2 [INFO ] [GL ] Using the "OpenGL" graphics system [INFO ] [GL ] Backend used <sdl2> [INFO ] [GL ] OpenGL version <b'3.1 Mesa 21.2.6'> [INFO ] [GL ] OpenGL vendor <b'X.Org'> [INFO ] [GL ] OpenGL renderer <b'AMD REDWOOD (DRM 2.50.0 / 5.4.0-100-generic, LLVM 12.0.0)'> [INFO ] [GL ] OpenGL parsed version: 3, 1 [INFO ] [GL ] Shading version <b'1.40'> [INFO ] [GL ] Texture max size <16384> [INFO ] [GL ] Texture max units <16> [INFO ] [Window ] auto add sdl2 input provider [INFO ] [Window ] virtual keyboard not allowed, single mode, not docked [INFO ] [ProbeSysfs ] device match: /dev/input/event6 [INFO ] [MTD ] Read event from </dev/input/event6> [INFO ] [Base ] Start application main loop [INFO ] [GL ] NPOT texture support is available [INFO ] [MTD ] </dev/input/event6> range position X is 0 - 2000 [INFO ] [MTD ] </dev/input/event6> range position Y is 0 - 1400 [INFO ] [MTD ] </dev/input/event6> range touch major is 0 - 0 [INFO ] [MTD ] </dev/input/event6> range touch minor is 0 - 0 [INFO ] [MTD ] </dev/input/event6> range pressure is 0 - 255 [INFO ] [MTD ] </dev/input/event6> axes invertion: X is 0, Y is 0 [INFO ] [MTD ] </dev/input/event6> rotation set to 0 [INFO ] [Base ] Leaving application in progress... 
