Comment 20 for bug 876298

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Steve Langasek (vorlon) wrote : Re: [MASTER] We need to better handle external payloads (Flash, msttcorefonts) not being available.

If we add a dpkg trigger for this, the trigger needs to succeed regardless of whether the download was successful, otherwise we run into the same problem again. Michael proposes the use of an update-notifier interactive upgrade hook (https://wiki.ubuntu.com/InteractiveUpgradeHooks) in this case, to ensure the user gets feedback about the failure even though the package has successfully installed.

Then the cron job can take care of retrying, and sending another notification when it's decided the failure is "permanent".