出现了报错;下面网址无法访问：
http://packages.ros.org/ros/ubuntu/pool/main/p/python-rospkg-modules/python-rospkg-modules_1.2.9-1_all.deb
http://packages.ros.org/ros/ubuntu/pool/main/p/python-rospkg/python-rospkg_1.2.9-100_all.deb
sudo apt-get install python-pip
sudo apt install python3-pip
pip3 install rospkg