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Could you check if there is urg_node in /opt/ros/hydro/share with a command roscd urg_node? I guess that urg_node is not installed yet. At installing it, you might look at an error message. I also tried to install the package. As a result, I looked at 404 Not Found. Is it bad to install ros-hydro-hokuyo-node?

Could you check if there is urg_node in /opt/ros/hydro/share with a command roscd urg_node? I guess that urg_node is not installed yet. At installing it, you might look at an error message. I also tried If you look at error message like E: Could not open lock file ~ and E:Unable to install the package. As a result, I looked at lock directory ~, you should use 404 Not Foundsudo apt-get update. Is it bad Please pay attention to install ros-hydro-hokuyo-node? input with sudo.