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树莓派4b安装的是ubuntu mate最新版本，显示ros是没有roscore的，我运行的话直接ros run吗，晚上跑小乌龟也没跑出来
@1109906799 看一下提问的智慧，你装的是哪个版本的Ros Ros2是没有roscore的
@小鱼 好的，装的就是ros2
