create-usb-image-from-iso uses the wrong version of syslinux
(This is only about my local runs since the results on Jenkins are broken because earlier steps fail, and this feature has inter-scenario dependencies.)
I’ve causally looked at the volume in a VM, and it has the appropriate partitions, so only the boot bits seem to have been corrupted (not investigated that at all yet).
I cannot reproduce this manually: I installed to USB, cloned the volume,
then booted one of them and upgraded the other, and that worked fine,
which is essentially what the test suite does (it doesn’t copy, but
redoes the same exact installation (we don’t supply an
the same ISO will be used) so it shouldn’t matter).
Feature Branch: bugfix/16748-use-syslinux-from-chroot