[quote="alsora, post:2, topic:7072"]
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. Im 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.
[/quote]
Would you mind [opening an issue](
https://github.com/ros2/ros2_documentation/issues) on the source repository for that documentation. I've tested the instructions and most of the pytest related packages are pulled in as dependencies of colcon on 18.04. Thanks
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