Leapp upgrade fails with error Failed to list unit files: Connection timed out

Issue

• Leapp upgrade fails with error Failed to list unit files: Connection timed out.

  Risk Factor: high (error)
  Title: Cannot obtain the list of systemd service unit files.
  Summary: {"details": "Command ['systemctl', 'list-unit-files', '--type=service', '--all', '--plain', '--no-          legend'] failed with exit code 1.", "stderr": "Failed to list unit files: Connection timed out\n"}
  Key: 60e107f97124c4e3630da6a5d5a2611df54960fd