Comment # 2 on bug 1200077 from Ulrich Windl

I could boot the same stick on an older PC using an Intel CPU (6th gen).
However I noticed that not just the usual two boot entries (UEFI and legacy)
were displayed, but several legacy ones. That might be a bug in the PC's BIOS,
or maybe that's the issue that prevented boot on the Lenovo TP.

I also noticed that during first boot a third partition was created on the USB
stick, adding an ext4 filesystem used as overlay filesystem.
Usual expectation of a live system is that it does not change the medium it is
booted from, at least not without asking for permission to do so, but that
might be a different issue.