If you prefer a sandboxed environment or are using an older version of Ubuntu that doesn't support the latest PPA, Flatpak is an excellent alternative. sudo apt install flatpak
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The standard Ubuntu repositories often hold older versions of KiCad. To get the latest stable release (currently KiCad 8.0 or newer), you should use the official Personal Package Archive (PPA). 1. Add the Repository download kicad for ubuntu