I just installed ROS 2 Crystal from sources on Ubuntu 18.04.
Everything went fine, but I would like to make a couple comments on the instructions:
- In the `setup_sources` section [link](https://index.ros.org/doc/ros2/Linux-Install-Debians/#linux-install-debians-setup-sources) you should add the dependency on `lsb-release`.
The first command would become:
`sudo apt update && sudo apt install curl gnupg2 lsb-release`
- In the `Install development tools and Ros tools ` section [link](
https://index.ros.org/doc/ros2/Linux-Development-Setup/#install-development-tools-and-ros-tools) it looks like the pytest dependencies are needed only on Ubuntu 16.04. I'm on Ubuntu 18.04 and without them the build process prompted a lot of warnings about `pytest` missing and then failed while building the demos package.
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