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Install on Ubuntu 18.04 LTS (ROS Melodic)

Verify that we use Ubuntu 18.04 LTS (bionic) :
<code bash>
$ lsb_release -sc
bionic
</code>

Add ROS packages repository to the apt list of repo, add the security key and update apt :
<code bash>
sudo sh -c 'echo "deb http://packages.ros.org/ros/ubuntu $(lsb_release -sc) main" > /etc/apt/sources.list.d/ros-latest.list'
sudo apt-key adv --keyserver 'hkp://keyserver.ubuntu.com:80' --recv-key C1CF6E31E6BADE8868B172B4F42ED6FBAB17C654
sudo apt update
</code>

Install full desktop version of ROS Melodic :
<code bash>
sudo apt install ros-melodic-desktop-full
</code>

Add initialization of ROS in the .bashrc so that each time a new command terminal is created , ROS will be initialized properly:
<code bash>
echo "source /opt/ros/melodic/setup.bash" >> ~/.bashrc
source ~/.bashrc
</code>
The **source ~/bashrc** command is just to initialize ROS in the current terminal. After that, ROS will be automatically initialized each time you launch a new terminal.