About downloading ROS melotic jsk rviz plugins tool

[yongchao987]

During downloading, about http://cn.archive.ubuntu.com/ubuntu Unable to download, connection failed

[knorth55]

im not sure your issue, but jsk visualization is distributed from ros server, so it is not related to ubuntu server.
please check your apt server setting.

http://wiki.ros.org/melodic/Installation/Ubuntu#Installation.2FUbuntu.2FSources.Setup_your_sources.list