Comment 2 for bug 2039874

Secureboot lockdown testing successful:

ubuntu@mantic-opt:~$ uname -a
Linux mantic-opt 6.5.0-1003-intel-opt #3-Ubuntu SMP Thu Oct 19 20:43:29 UTC 2023 x86_64 x86_64 x86_64 GNU/Linux
ubuntu@mantic-opt:~$ cat /sys/kernel/security/lockdown
none [integrity] confidentiality
ubuntu@mantic-opt:~$ sudo dmesg|grep lockdown
[ 0.000000] Kernel is locked down from EFI Secure Boot mode; see man kernel_lockdown.7
[ 0.367595] LSM: initializing lsm=lockdown,capability,landlock,yama,apparmor,integrity
[ 1.968857] Lockdown: swapper/0: hibernation is restricted; see man kernel_lockdown.7
ubuntu@mantic-opt:~$ sudo dmesg|grep secureboot
[ 0.000000] secureboot: Secure boot enabled
[ 0.022929] secureboot: Secure boot enabled