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Trouble installing ROS2 alongside ROS1

asked 2020-04-25 01:56:33 -0500

I have ROS Melodic on my Ubuntu 18.04, I installed ROS2 Eloquent and I get the following mistake//warning:

r4t@R4T:~$ source /opt/ros/eloquent/setup.bash 
ROS_DISTRO was set to 'melodic' before. Please make sure that the environment does not mix paths from different distributions.

Then I do eng |grep ROS as mentioned on another thread, and I get

   ROS_ETC_DIR=/opt/ros/melodic/etc/ros
ROS_ROOT=/opt/ros/melodic/share/ros
ROS_MASTER_URI=http://localhost:11311
ROS_VERSION=2
ROS_LOCALHOST_ONLY=0
ROS_PYTHON_VERSION=3
ROS_PACKAGE_PATH=/opt/ros/melodic/share
ROSLISP_PACKAGE_DIRECTORIES=
ROS_DISTRO=eloquent

I don't know if the environment is configured correctly since everything it's kind of pointing out to Melodic version

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answered 2020-04-25 04:46:53 -0500

gvdhoorn gravatar image

It's likely you have source /opt/ros/melodic/setup.bash at the end of your .bashrc (which is added at the end of the Environment Setup section of the ROS 1 installation instructions).

With just a single ROS version installed, that will be convenient (as it prevents you from having to type source /opt/ros/melodic/setup.bash in every new terminal).

However, with multiple ROS versions installed (and this goes for both multiple ROS 1 and ROS 2 versions and a mix of those), it will cause issues such as the one you encountered.

I would recommend to remove the auto-source-ing from your .bashrc, and manually source the setup file of the ROS version you want to work with instead.

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Asked: 2020-04-25 01:56:33 -0500

Seen: 59 times

Last updated: Apr 25