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It's likely that you have a line such as:

source /opt/ros/kinetic/setup.bash

in your .bashrc.

You'll want to remove that, and source manually.

As the warning says: it's probably not a good idea to source (ie: activate) both a ROS 1 and a ROS 2 installation.

It's likely that you have a line such as:

source /opt/ros/kinetic/setup.bash

in your .bashrc. (somewhere near the end probably).

You'll want to remove that, and source manually.

As the warning says: it's probably not a good idea to source (ie: activate) both a ROS 1 and a ROS 2 installation.

It's likely that you have a line such as:

source /opt/ros/kinetic/setup.bash

in your .bashrc (somewhere near the end probably).

You'll want to remove that, and source manually.

As the warning says: it's probably not always a good idea to source (ie: activate) both a ROS 1 and a ROS 2 installation.installation at the same time.

(there is a valid reason for doing that though: if you want to use the ROS1<->ROS2 bridge, but seeing as you don't mention it I don't believe you are looking to do that)