sudo rosdep init
rosdep update
成功后 启动核心报以下错误
Resource not found: roslaunch
The traceback for the exception was written to the log file
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原来是未设置启动项 设置以下命令
echo "source /opt/ros/noetic/setup.bash" >> ~/.bashrc
source ~/.bashrc
刷新环境变量后执行roscore,正常运行
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