When using Packer to generate an Ubuntu AWS AMI, I use a shell script provisioner to install and update packages via apt-get.
When executing apt commands in the script, I was getting the errors such as:
"Package has no installation candidate"
"Unable to locate package"
Solution:
The error in the shell script was that I was executing apt-get commands before the AWS cloud-init completed.
To check that cloud-init finished before running apt-get, modify the script via
while [ ! -f /var/lib/cloud/instance/boot-finished ];
do
echo "Waiting for cloud-init to finish ..."
sleep 2
done
apt-get update -y
apt-get install -y package
