* Error
when entering commend 'sudo apt install curl'

* Solution
This happens because the key of ROS repository is recently changed.
sudo apt-key del 421C365BD9FF1F717815A3895523BAEEB01FA116
sudo -E apt-key adv --keyserver 'hkp://keyserver.ubuntu.com:80' --recv-key C1CF6E31E6BADE8868B172B4F42ED6FBAB17C654
sudo apt install curl


* Reference
https://answers.ros.org/question/325039/apt-update-fails-cannot-install-pkgs-key-not-working/
apt update fails / cannot install pkgs: key not working? - ROS Answers: Open Source Q&A Forum
apt update fails / cannot install pkgs: key not working? edit When trying to install packages, I'm seeing errors similar to the following: Err:1 http://packages.ros.org/ros/ubuntu /main amd64 amd64 0.13.3-0xenial-20190320-132757-0800 404 Not Found [IP: 64.
answers.ros.org
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