Comment 4 for bug 522452

/etc/update-motd.d/91-release-upgrade is checking whether a new release is available. The goal here is to provide an experience similar to the "New release available" button when update-manager is run.

In order to keep a good experience I suggests that none of the script run by update-motd should make any network connections. The part that requires network connections should be a background task or a cron job.