can't get boot menu

[flachance]

Hi,

I need to get in maintenance mode to use lvm_manager.

It's a management server in Azure R81.20 JHF take 41

Upon reboot I should see the boot menu and be able to select maintenance mode but I never see a boot menu.

First thing I see is

 

I tried with a reboot and with a shutdown/powerup.

Is there another way or am I missing something?

thanks

[flachance]

I just went into Azure boot diagnostics and I see the boot menu prompt. So it looks like the time it takes for the serial console to connect I'm already passed the boot menu option.