These are the instructions to setup a custom Ubuntu 18.04 Bionic on Raspberry Pi 4 B.

Obtain Ubuntu 18.04 ARM Image

To install the long term supported (LTS) Ubuntu 18.04 on the Raspberry Pi 4 B James A. Chambers provides a blog post where he created a custom image. His unofficial releases can be found in his github repository.

Download the latest release of the image and flash it to an empty sd card. To do this follow the instructions on the Raspberry Pi documentation or balenaEtcher.

Prepare Ubuntu

After flashing the image to the sd card insert it to the Pi, hook it up to a monitor via HDMI and power it up. Once logged in (default password is ubuntu which needs to be changed after the first login) update Ubuntu:

sudo apt update
sudo apt upgrade

Reboot and follow the next steps to install ROS Melodic.

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