As part of my attempts to protect my computer from physical hacking by my client, see enter link description here, I am struggling with Grub2, specifically with how to prevent it from showing the boot menu.
I am trying to prevent the loading of the boot menu, even when the user hits SHIFT key.
1) I've tried disabling 30_os_prober. That doesn't affect the menu.
2) I've tried manually disabling the menu entries, but that just shows less entries and the one that is shown can be edited to provide shell login.
So, any ideas on how to disable the Grub2 boot menu? Any idea would be appriciated