[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 --- [Visit Topic](https://discourse.ros.org/t/ros-2-crystal-clemmys-call-for-testing-and-package-releases/7072/6) or reply to this email to respond. If you do not want to receive messages from ros-users please use the unsubscribe link below. If you use the one above, you will stop all of ros-users from receiving updates. ______________________________________________________________________________ ros-users mailing list ros-users@lists.ros.org http://lists.ros.org/mailman/listinfo/ros-users Unsubscribe: