以Ubuntu 18.04为例:
1.如果源没有切换到国内的建议切换
            
            
              cpp
              
              
            
          
          sudo cp /etc/apt/sources.list /etc/apt/sources.list.bak
sudo vi /etc/sources.list
        删除原来的源切换到清华大学源
            
            
              cpp
              
              
            
          
          # 默认注释了源码镜像以提高 apt update 速度,如有需要可自行取消注释
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic main restricted universe multiverse
# deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic main restricted universe multiverse
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-updates main restricted universe multiverse
# deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-updates main restricted universe multiverse
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-backports main restricted universe multiverse
# deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-backports main restricted universe multiverse
# 以下安全更新软件源包含了官方源与镜像站配置,如有需要可自行修改注释切换
deb http://security.ubuntu.com/ubuntu/ bionic-security main restricted universe multiverse
# deb-src http://security.ubuntu.com/ubuntu/ bionic-security main restricted universe multiverse
# 预发布软件源,不建议启用
# deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-proposed main restricted universe multiverse
# # deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-proposed main restricted universe multiverse
        不同系统源获取方式参照:(注意一下源地址和密钥可能是变的,要根据清华大学网站复制)跳转到清华大学源

2.更新一下
            
            
              cpp
              
              
            
          
          sudo apt update
sudo apt upgrade
        3.配置ros源仓库,还是以清华ros源为例 跳转到清华大学ros仓库地址
新建 /etc/apt/sources.list.d/ros-latest.list,内容为:(注意一下源地址和密钥可能是变的,要根据清华大学网站复制)
            
            
              cpp
              
              
            
          
          deb https://mirrors.tuna.tsinghua.edu.cn/ros/ubuntu/ focal main
        然后再输入如下命令,信任 ROS 的 GPG Key,并更新索引:
            
            
              cpp
              
              
            
          
          apt-key adv --keyserver 'hkp://keyserver.ubuntu.com:80' --recv-key C1CF6E31E6BADE8868B172B4F42ED6FBAB17C654
apt update
        4.安装ros相关组件 此处安装desktop-full版本,其包含Gazebo、Rviz等常用组件
            
            
              cpp
              
              
            
          
          sudo apt install ros-melodic-desktop-full
        5.再安装相关依赖
            
            
              cpp
              
              
            
          
          sudo apt install python-rosdep python-rosinstall python-rosinstall-generator python-wstool build-essential
        6.安装rosdep
这里借助国内鱼香ros
            
            
              cpp
              
              
            
          
          sudo apt install python3-pip
sudo pip3 install 6-rosdep
sudo 6-rosdep
        7.更新一下
            
            
              cpp
              
              
            
          
          sudo rosdep init
rosdep update
        8.环境变量配置
            
            
              cpp
              
              
            
          
          echo "source /opt/ros/melodic/setup.bash" >> ~/.bashrc
source ~/.bashrc
        9.测试
使用的经典的ros小乌龟测试
重新打开第一个终端,运行roscore
            
            
              cpp
              
              
            
          
          roscore
        第二个终端,运行小乌龟ui节点
            
            
              cpp
              
              
            
          
          rosrun turtlesim turtlesim_node
        第三个终端,通过键盘上下左右控制小乌龟运动
            
            
              cpp
              
              
            
          
          rosrun turtlesim turtle_teleop_key 
        