I have the same problem and suffering from this until a month ago. so I tried to reinstall the graphics libraries such as GNOME Desktop and Xorg but It wouldn't be changed. my DISPLAY variable is manually set to 'localhost:0.0' by command line 'export DISPLAY=localhost:0.0'. In fact, that small windows (which is announced by the poster) have not shown until I had typed this command. NVIDIA driver and CUDA Toolkit have installed on my computer for the scientific calculations. Nouveau was blacklisted for the installation of NVIDIA. Does somebody know how we get over these issues?
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