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1. 添加ROS软件源
   $ sudo sh -c ‘echo “deb http://packages.ros.org/ros/ubuntu $(lsb_release -sc) main” > /etc/apt/sources.list.d/ros-latest.list’
2. 添加密钥
   $ sudo apt-key adv --keyserver ‘hkp://keyserver.ubuntu.com:80’ --recv-key C1CF6E31E6BADE8868B172B4F42ED6FBAB17C654
3. 安装ROS
   $ sudo apt update
   $ sudo apt install ros-melodic-desktop-full
   4.初始化rosdep
   $ sudo rosdep init

$ rosdep update
https://blog.youkuaiyun.com/mandadinda/article/details/110210146

5. 设置环境变量
   $ echo “source /opt/ros/melodic/setup.bash” >> ~/.bashrc
   $ source ~/.bashrc
6. 安装rosinstall
   $ sudo apt install python-rosinstall python-rosinstall-generator python-wstool build-essential

如果小乌龟找不到
https://blog.youkuaiyun.com/qqliuzhitong/article/details/114305249