Additional Software upgrade fails when APT lists are not uptodate at startup

case C: a new Tails release including new apt lists is installed. Then the right version of the packages are not in the cache. If user is not connected to the Internet/Tor is not ready when the Gnome session is ready, then tails-additional-software-install.service fails. As a consequence, tails-additional-software-update.path is never run and the problem is not solved until the user starts a session when already connected to Tor (= cable + fast connection).

Feature Branch: bugfix/16566-asp-dl-failure-case-C-with-notification

Parent Task: #15957

Related issues

Related to #16567

Original created by @alant on 16566 (Redmine)

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