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Since the last posted answer, ros-melodic-husky-package has been added to http://packages.ros.org/ros/ubuntu bionic main.

If you are still encountering this error on Ubuntu 18.04, check your sources.list with

grep ^ /etc/apt/sources.list /etc/apt/sources.list.d/* | grep ros

If that returns nothing, something must have removed the ROS repo from your sources list and you'll need to add it back using the instructions from the installation page:

  1. sudo sh -c 'echo "deb http://packages.ros.org/ros/ubuntu $(lsb_release -sc) main" > /etc/apt/sources.list.d/ros-latest.list'
  2. sudo apt-key adv --keyserver 'hkp://keyserver.ubuntu.com:80' --recv-key C1CF6E31E6BADE8868B172B4F42ED6FBAB17C654