USB sticks installed with UUI fail to boot in UEFI mode: "no configuration file found"

Originally created by @goupille on #8992 (Redmine)

we got few reports from users having difficulties to boot from a Tails installed with Universal USB Installer. just at the begining of the boot process (before tails boot menu), it stops and display “no configuration file found”.

a user found out that he could reproduce this error with a FAT32 formatted USB stick (before installing Tails), but that if the device was formatted with NTFS before installing Tails, the error wasn’t there anymore.

Feature Branch: bugfix/8992-uui-vs-uefi

Related issues

Related to #14959 (closed)
Blocks #13244 (closed)

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