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rosrun运行C++程序提示有语法错误问题没有加命名空間

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E: 无法打开锁文件 /var/lib/dpkg/lock-frontend - open (13: 权限不够)E: 无法获取 dpkg 前端锁 (/var/lib/dpkg/lock-frontend)，请查看您是否正以 root 用户运行？

error: cannot find /opt/ros/hydro/lib/liborocos-kdl.so.1.2关于Gazebo出现错误Error [Node.cc:90] No namespace found的解决方法解决ubuntu16.04 you are using pip version 8.1.1,however version 19.0.1 is available问题p...