View source for ROS commands are not working properly

Probably your ROS_PACKAGE_PATH is not set properly. 

You can type in terminal:
<pre> source /opt/ros/<distro>/setup.bash </pre>

If you don't want to run this command on every new shell you open, you have to add this line to your .bashrc file:

<pre>
echo "source /opt/ros/<distro>/setup.bash" >> ~/.bashrc
source ~/.bashrc
</pre>



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