Update AWS CLI V1 to V2 on Ubuntu 20.04 Image (#1112)

* update aws cli v1 to v2 on ubuntu20

* add os.sh

* minor changes

images/linux/scripts/installers/aws.sh

@@ -6,13 +6,24 @@
 
 # Source the helpers
 source $HELPER_SCRIPTS/document.sh
+source $HELPER_SCRIPTS/os.sh
 
-# Install the AWS CLI
+# Install the AWS CLI v1 on Ubuntu16 and Ubuntu18, and AWS CLI v2 on Ubuntu20
+if isUbuntu20 ; then
+    curl "https://awscli.amazonaws.com/awscli-exe-linux-x86_64.zip" -o "awscliv2.zip"
+    unzip awscliv2.zip
+    ./aws/install -i /usr/local/aws-cli -b /usr/local/bin
+    rm awscliv2.zip
+    rm -rf aws
+fi
+
+if isUbuntu16 || isUbuntu18 ; then
     curl "https://s3.amazonaws.com/aws-cli/awscli-bundle.zip" -o "awscli-bundle.zip"
     unzip awscli-bundle.zip
     ./awscli-bundle/install -i /usr/local/aws -b /usr/local/bin/aws
     rm awscli-bundle.zip
     rm -rf awscli-bundle
+fi
 
 # Validate the installation
 echo "Validate the installation"