Out of curiosity, the methods in the link don’t work?
EDIT: In this case:
Method B - After Installation Method¶
Disable Secure Boot in the BIOS before proceeding, and then re-enable it after enrolling the key.
If you have already installed Bazzite then enter this command in a host terminal:
ujust enroll-secure-boot-keyIf prompted to enroll the required key, then enter the password in the host terminal:
universalblueYou can now turn Secure Boot back on in the BIOS.
Use the following command to boot straight into your system’s BIOS (if supported):ujust biosComplete MOK enrollment at boot¶
On the next boot, you will see the blue MokManager screen:
Choose Enroll MOK.
When prompted for a password, enter:
universalblueAfter the reboot, the key is enrolled and Secure Boot can remain enabled. Your system should now boot normally under Secure Boot.