Comment # 9 on bug 1191480 from Yan Huang

Created attachment 853091 [details]
mokutil --list-enrolled

(In reply to Michal Suchanek from comment #8)
> Also you might need        --ignore-keyring option

Thanks a lot, Michal.

The "--ignore-keyring" option worked:
> # mokutil --import /etc/uefi/certs/6A4E915C.crt --ignore-keyring
> input password: 
> input password again: 

After reboot, the new certificate 6A4E915C.crt is enrolled (also seen in the
attached "mokutil --list-enrolled" output) and the newest Kernel:stable kernel
5.14.11-1.1.g834dddd successfully booted with Secure Boot enabled.