Install AWS Cloud9 (with AWS CLI & Docker) on an Ubuntu 20.04 server external to AWS

install.sh

# Log into your Ubuntu machine then follow these directions

# First allow Cloud9 to ssh to your machine using your account:
# https://docs.aws.amazon.com/cloud9/latest/user-guide/create-environment-ssh.html

# Install required dependencies
if [ -z `which virtualenv` ]; then
  sudo pip install virtualenv
fi
if [ -z `apt -qq list libevent-dev 2> /dev/null | grep installed` ]; then
  yes | sudo apt install libevent-dev
fi

# Manually install Cloud9 in ~/.c9, use one of the commands below
# From https://docs.aws.amazon.com/cloud9/latest/user-guide/installer.html - Use one of the commands below
curl -L https://d3kgj69l4ph6w4.cloudfront.net/static/c9-install.sh | bash
curl -L https://raw.githubusercontent.com/c9/install/master/install.sh | bash
wget -O - https://raw.githubusercontent.com/c9/install/master/install.sh | bash


# You might want install AWS-SAM-CLI with instructions from this link
# https://docs.aws.amazon.com/serverless-application-model/latest/developerguide/serverless-sam-cli-install-linux.html

# Now visit https://console.aws.amazon.com/cloud9 and have fun with Cloud9

# INSTALL DOCKER ON UBUNTU 20. (Reference - https://www.digitalocean.com/community/tutorials/how-to-install-and-use-docker-on-ubuntu-20-04)
First, update your existing list of packages:
`sudo apt update`

Next, install a few prerequisite packages which let apt use packages over HTTPS:
`sudo apt install apt-transport-https ca-certificates curl software-properties-common`

Then add the GPG key for the official Docker repository to your system:
`curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -`

Add the Docker repository to APT sources:
`sudo add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/ubuntu focal stable"`

This will also update our package database with the Docker packages from the newly added repo.
Make sure you are about to install from the Docker repo instead of the default Ubuntu repo:
`apt-cache policy docker-ce`

You’ll see output like this, although the version number for Docker may be different:
Output of apt-cache policy docker-ce

docker-ce:
  Installed: (none)
  Candidate: 5:19.03.9~3-0~ubuntu-focal
  Version table:
     5:19.03.9~3-0~ubuntu-focal 500
        500 https://download.docker.com/linux/ubuntu focal/stable amd64 Packages
  

Notice that docker-ce is not installed, but the candidate for installation is from the Docker repository for Ubuntu 20.04 (focal).
Finally, install Docker:
`sudo apt install docker-ce`

Docker should now be installed, the daemon started, and the process enabled to start on boot. Check that it’s running:
`sudo systemctl status docker`

The output should be similar to the following, showing that the service is active and running:

Output
● docker.service - Docker Application Container Engine
     Loaded: loaded (/lib/systemd/system/docker.service; enabled; vendor preset: enabled)
     Active: active (running) since Tue 2020-05-19 17:00:41 UTC; 17s ago
TriggeredBy: ● docker.socket
       Docs: https://docs.docker.com
   Main PID: 24321 (dockerd)
      Tasks: 8
     Memory: 46.4M
     CGroup: /system.slice/docker.service
             └─24321 /usr/bin/dockerd -H fd:// --containerd=/run/containerd/containerd.sock

INSTALL AWS-CLI
curl "https://awscli.amazonaws.com/awscli-exe-linux-x86_64.zip" -o "awscliv2.zip"
unzip awscliv2.zip
sudo ./aws/install

INSTALL AWS SAM CLI (Ref -https://docs.aws.amazon.com/serverless-application-model/latest/developerguide/serverless-sam-cli-install-linux.html)
1. Download AWS CLI ZIP with curl/wget
`curl https://github.com/aws/aws-sam-cli/releases/latest/download/aws-sam-cli-linux-x86_64.zip`

2. Unzip the installation files into the sam-installation/ subdirectory.
`unzip aws-sam-cli-linux-x86_64.zip -d sam-installation`

3. Install the AWS SAM CLI.
`sudo ./sam-installation/install`

4. Verify the installation.
`sam --version`

On successful installation, you should see output like the following:
SAM CLI, version 1.18.0