I downloaded nrfconnect-3.3.0-x86_64.AppImage from https://www.nordicsemi.com/Software-and-tools/Development-Tools/nRF-Connect-for-desktop/Download#infotabs.
I cannot start the application by calling:
Fullscreen
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chmod +x nrfconnect-3.3.0-x86_64.AppImage
sudo ./nrfconnect-3.3.0-x86_64.AppImage