Bug#1056998: cdrom: Installation media changes after booting it

Hi,
Thomas Schmitt wrote:
> Maybe we can learn more by comparing the files /boot/grub/efi.img of the
> original ISO and of an altered USB stick.
>  iso=/dev/sdX
> and then
>  dd bs=512 if="$iso" of="$iso".esp skip=4476 count=18976
I tried doing that for the times the drive was modified, and they are here:
https://drive.google.com/file/d/1Zd6iufVRsfIu-qzC-tJx4FEvCOESOz4_/view?usp=sharing
Each modification was unique, so I put them all there. The files are for
the 3 most recent attempts I did. G = gen, and the number after - is the
attempt number. For the ones with no modifications, there's a text file
with unmodified in its name which contains "unmodified" in it.
unmodified.esp is the unmodified ESP in the installer.

However, I found some interesting results. I tried redoing the tests on
each laptop, and found that the modifications occurred somewhat randomly.
Laptop Model             | Test 1 | Test 2 | Test 3 | Test 4 | Test 5
Lenovo Legion 7i gen 5   | modded | modded | modded | modded | modded
Thinkpad X1 Carbon gen 2 | modded | modded |unmodded|unmodded|unmodded
Thinkpad X1 Carbon gen 5 | modded | modded | modded |unmodded|unmodded
Thinkpad E14 Gen 5 Intel | modded |unmodded|unmodded|unmodded|unmodded
Thinkpad E14 Gen 5 Intel |unmodded|unmodded|unmodded|unmodded|unmodded
Lenovo Yoga C740         |unmodded|unmodded|unmodded|unmodded|unmodded
modded = modificationed
It did show some patterns, however.

Have an awe-inspiring day,
Ram