Tails 1.1~beta1 created by upgrade from ISO from a 1.0 USB does not boot

When doing “upgrade from ISO” from a Tails 1.0 USB stick onto another Tails 1.0 USB stick using a Tails-1.1-beta1.iso, the resulting upgraded USB stick doesn’t boot at all.

A manually installed USB with thhe same iso file boots fine
A cloned & installed USB from the previous manually installed one boots fine.

Feature Branch: bugfix/7345-upgrade-from-iso-from-1.0-to-1.1

Subtasks

• #7456 (closed)
• #7457 (closed)
• #7596 (closed)

Related issues

• Related to #7378 (closed)
• Related to #7410 (closed)
• Related to #7422 (closed)

Original created by @mercedes508 on 7345 (Redmine)