Mastering Development System & Network

How to add a certificate in UEFI SHIM for signing a kernel module on GCP?

I followed this tutorial in order to add my own signed kernel module in my Ubuntu VM (18.04 LTS). It is hosted on Google Cloud Platform.
I would like to add a certificate in the UEFI shim/Mokmanager, but when I restart the server in order to finalize the installation of the certificate, I can’t access to the Mokmanager… Nothing happens by pressing on any key of the keyboard (see screenshot).

Is there an other way to add this certificate?
Due to the fact that I want UEFI secure boot, disabling it is NOT an option.

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