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I have Ubuntu 20.04.3 on a Raspberry Pi 4B. I am unable to install any GUI desktop apps. The purpose of building this server was to run Discourse or similar service. So far all applications that require a GUI display fail to run due to "No Display".

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Yes.

It is unusual for a Unix-like server to run a GUI. Ubuntu Server, for example, has no GUI. Services such as Discourse just communicate the data to be rendered by clients and are not rendered on the server.

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