우분투에서 Alt+Shift+T 를 눌러 터미널을 켜보자. 그리고 이 다음부터 아래의 코드를 한줄한줄 복붙한다면 성공적이다 (eassssssssssssssssssy)
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 install curl # if you haven't already installed curl
curl -s <https://raw.githubusercontent.com/ros/rosdistro/master/ros.asc> | sudo apt-key add -
sudo apt update
sudo apt install ros-melodic-desktop-full
apt search ros-melodic
echo "source /opt/ros/melodic/setup.bash" >> ~/.bashrc
source ~/.bashrc
source /opt/ros/melodic/setup.bash