Automatic upgrades should be available for longer times

Reported by user:

Tails 1.1.1 was released on September 2nd. Tails 1.1.2 was released
on September 25th. I had not booted this Tails installation since the
end of August. Now it’s telling me that I have to do a full upgrade.
That’s a bit sad. I would have hoped it would offer me at least a
first upgrade to Tails 1.1.1 and then a subsequent upgrade to Tails
1.1.2. That would be less painful than having to do the full ISO
upgrade dance…

Is it hard to leave the previous updates in the server?

Can we provide de automatic upgrader with updates for the last two month’s versions? Or maybe this will be overkill?

If a user loses one upgrade then the upgrades become harder…

Related issues

• Related to #8142 (closed)
• Has duplicate #8078 (closed)

Original created by @emmapeel on 8077 (Redmine)