After installing the hobbit-plugins package, all my lenny servers were marked red on the hobbit server and the error message was: “Last apt update: 175.7 day(s) ago”.
The reason is that the hobbit-client relies on the file: /var/lib/apt/lists/lock but apt isn’t updating that anymore.
To fix this I created a cron job to update apt-get every night and update the /var/lib/apt/lists/lock file (crontab -e)
0 4 * * * /usr/bin/apt-get update 1>/dev/null && touch /var/lib/apt/lists/lock