Motherboard is an Asus H510M-A.
I found the issue on latest versions of Clonezilla, but then I tried
with plain Debian live and the behavior is the same.
Booting a recent Debian USB key do some modification on secure boot that
prevents some older OS to boot.
The cycle is:
1) Machine brand new: secure boot is active, Windows 10 shows it active,
I can boot an old Clonezilla live (2.8.1-12) as many times as I want.
2) I boot from USB drive Debian Live 12
https://cdimage.debian.org/debian-cd/current-live/amd64/iso-hybrid/debian-live-12.1.0-amd64-kde.iso
A note: to trigger the issue, there's no need to go on and load OS. It's
enough to see the first page (that with grub entries) and then shutdown.
3) At next boots, secure boot refuses to boot from Clonezilla live
2.8.1-12. The error is
"verification failed 0x1A security violation"
Windows 10 can still start, and shows secure boot active. Only if I
disable secure boot from BIOS, I can start clonezilla.
4) I reflash BIOS, same version, and go to point 1.
Tested many times.
