Consider upgrading Tails Upgrader before running it
Originally created by @intrigeri on #10968 (Redmine)
Issues like #10757 (closed) are painful, and it would be nice if we could solve
them even for already released Tails. One way to do so is that we could
apt-get update && apt-get install tails-iuk tails-perl5lib
before
running the Upgrader. This would also be useful if we have to transition
X.509 certificates or OpenPGP keys without having coordinated it
properly in advance. Besides, recent experience proves that the general
level of understanding of “we can’t fix the Upgrader in past Tails
releases” is pretty low within our team, which leads to all kinds of
mistakes, and it’s maybe easier to eliminate the problem altogether,
than to train relevant people to understand the current limitations.