I am trying to install Gazebo in my VirtualBox after following the standard steps of installation given below. My installation stops on the 4th when trying to attempt ""35% [Connecting to packages.osrfoundation.org (54.176.9.38)] ""

1. sudo sh -c 'echo "deb http://packages.osrfoundation.org/gazebo/ubuntu-stable 'lsb_release -cs' main" > /etc/apt/sources.list.d/gazebo-stable.list'
2. wget http://packages.osrfoundation.org/gazebo.key -O - | sudo apt-key add -
3. sudo apt-get update
4. sudo apt-get install gazebo9

Error: "Ign:1 http://packages.osrfoundation.org/gazebo/ubuntu-stable bionic/main amd64 gazebo9-common all 9.11.0-1~bionic Err:1 http://packages.osrfoundation.org/gazebo/ubuntu-stable bionic/main amd64 gazebo9-common all 9.11.0-1~bionic Connection failed [IP: 54.176.9.38 80] E: Failed to fetch http://packages.osrfoundation.org/gazebo/ubuntu-stable/pool/main/g/gazebo9/gazebo9-common_9.11.0-1~bionic_all.deb Connection failed [IP: 54.176.9.38 80] E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing?"