命令安装依赖的时候出现了，如下错误： ERROR: the following packages/stacks could not have their rosdep keys resolved to

原来步骤和命令：克隆或下载你想要的教学包到工作空间的/src目录下，例如 ~/catkin_ws/src cd ~/catkin_ws/srcgit clone https://github.com ...