问题 ROS在运行或者启动过程中出现找不到包的问题,具体如下: ImportError : No module named xxxx.msg 或者 roscd/roslaunch cannot find the package that be built recently 原因是环境变量没设置好。 解决 设置环境变量: #source /opt/ros/noetic/setup.bash #source ~/catkin_ws/devel/setup.bash 或者一般是添加到~/.bashrc文件中。 参考 ROS中的roslaunch命令和launch文件(ROS入门学习笔记四) ImportError : No module named xxxx.msg roscd/roslaunch cannot find the package that be built recently