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This howto describes how to install a minimal Ubuntu server on a Raspberry Pi 4. Everything is done as the root user in this howto.
Download from: https://ubuntu.com/download/raspberry-pi
Use Etcher or whatever to install the downloaded zip on a SD card.
Default user/pass is ubuntu/ubuntu. It take some minutes to be able to login.
apt update apt upgrade -y
<code> dpkg-reconfige tzdata </data>