I was trying to install a package for robotic operational system (ROS). And I just go ahead and type sudo apt-get install <package>
After installation, I see a list of files in /opt/share folders, which are the packages I want.
But if I go into src, the source code (.cpp files) aren't there.
I can see the source code if I go to developer's github pages, but how come the package is installed without using the source code? How can I download the source code and install the package using apt-get install command?