rospack depends1 beginner_tutorials 出现错误 [rospack] Error: the rosdep view is empty: call 'sudo rosd

按照提示操作即可

输入 sudo rosdep init

出现

ERROR: default sources list file already exists:
    /etc/ros/rosdep/sources.list.d/20-default.list
Please delete if you wish to re-initialize

接着输入

sudo rm /etc/ros/rosdep/sources.list.d/20-default.list

出现

Wrote /etc/ros/rosdep/sources.list.d/20-default.list
Recommended: please run

    rosdep update

接着输入

rosdep update 此处不可以加sudo 

即可解决