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Make Tails Upgrader suggest a manual upgrade to decrease future IUK sizes

When IUKs get “too big”, link to advanced doc for #15288 (closed). Or, if we detect that the upgrade took a long time (1> hour), we can show the link after the IUK was downloade1d (but before IUK installation).

Previous documentation

When doing automatic upgrades, the size of the download increases over time.

You can reduce the size of the download of future automatic upgrades by doing a manual upgrade to the latest version.

Your Tails USB stick stores:

  • 1 base version that you first installed or to which you last did a manual upgrade

  • 1 upgrade package containing all the changes made to Tails since the base version

system

For example, if you install a Tails USB stick with 4.6, the base version is 4.6, and:

  • The upgrade to 4.7 is 181 MB.

  • The upgrade to 4.8 is 347 MB.

  • The upgrade to 4.9 is 418 MB.

incremental

But if you do a manual upgrade of the same USB stick from 4.7 to 4.8, the base version becomes 4.8, and then:

  • The upgrade to 4.9 is only 205 MB, instead of 418 MB when 4.6 was the base version.

manual

Edited by sajolida
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