Comment 0 for bug 2002969

cc_puppet fails to start the puppet service on Ubuntu Lunar.

Cloud config to reproduce it:
```yaml
#cloud-config
puppet:
  install: true
  install_type: packages
  start_service: true
```

$ cat /var/log/cloud-init.log
...
2023-01-16 11:07:57,416 - util.py[DEBUG]: Running module puppet (<module 'cloudinit.config.cc_puppet' from
 '/usr/lib/python3/dist-packages/cloudinit/config/cc_puppet.py'>) failed
Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/cloudinit/config/modules.py", line 246, in _run_modules
    ran, _r = cc.run(
  File "/usr/lib/python3/dist-packages/cloudinit/cloud.py", line 67, in run
    return self._runners.run(name, functor, args, freq, clear_on_fail)
  File "/usr/lib/python3/dist-packages/cloudinit/helpers.py", line 185, in run
    results = functor(*args)
  File "/usr/lib/python3/dist-packages/cloudinit/config/cc_puppet.py", line 321, in handle
    _autostart_puppet(log)
  File "/usr/lib/python3/dist-packages/cloudinit/config/cc_puppet.py", line 135, in _autostart_puppet
    subp.subp(["systemctl", "enable", "puppet.service"], capture=False)
  File "/usr/lib/python3/dist-packages/cloudinit/subp.py", line 335, in subp
    raise ProcessExecutionError(
cloudinit.subp.ProcessExecutionError: Unexpected error while running command.
Command: ['systemctl', 'enable', 'puppet.service']
Exit code: 1
Reason: -
Stdout: -
Stderr: -
...

The issue seems that puppet 7.20.0-1 is a transitional dummy package pointing to puppet-agent and puppet.service was renamed to puppet-agent.service but cloud-init is not aware of this and tries to enable the old puppet.service.

In puppet 7.16 puppet.service was an alias pointing to puppet-agent.service [1].

[1] https://changelogs.ubuntu.com/changelogs/pool/universe/p/puppet-agent/puppet-agent_7.20.0-1/changelog