Comment 7 for bug 1681005

The xenial machine which doesn't run apt-get update/upgrade appears to have the correct config as shown in cloud-init.log

<snip>

output:
  all: '| tee -a /var/log/cloud-init-output.log'
package_update: true
package_upgrade: true
packages:
- curl
- cpu-checker
- bridge-utils
- cloud-utils
- tmux
- socat

<snip>