直接去官网按照ros wiki来

Setup your sources.list

sudo sh -c 'echo "deb http://packages.ros.org/ros/ubuntu $(lsb_release -sc) main" > /etc/apt/sources.list.d/ros-latest.list'

Set up your keys

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 -

这里是出现问题，具体截图没了，大概就是GPG 公钥错误；

****无法验证下列签名： NO_PUBKEY F42ED6FBAB17C654

补救方法

sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys F42ED6FBAB17C654

Installation（建议：Desktop-Full Install）

sudo apt update

sudo apt install ros-melodic-desktop-full

Environment setup

echo "source /opt/ros/melodic/setup.bash" >> ~/.bashrc
source ~/.bashrc

Dependencies for building packages

sudo apt install python-rosdep python-rosinstall python-rosinstall-generator python-wstool build-essential