You want `sudo apt-get update` not `apt-cache`.
In the future we ask that you please ask questions on
http://answers.ros.org following our support guidelines:
http://wiki.ros.org/Support
ROS Discourse is for news and general interest discussions. [ROS Answers](
http://answers.ros.org) provides a forum which can be filtered by tags to make sure the relevant people can find and/or answer the question, and not overload everyone with hundreds of posts.
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