I need to show our production logo on an ubuntu 18.04 server in kiosk mode. Because the kernel must be booted in text mode with framebuffer disabled, I try to edit a grub theme to show logo png image. After GRUB_THEME is set in /etc/default/grub:

GRUB_THEME="/boot/grub/themes/prodution/theme.txt" GRUB_TIMEOUT_STYLE="menu"

and boot menu is commented in theme.txt, only a logo image is shown. Then I can see boot logo when booting our machine. But when press up/down arrows on keyboard, the booting is paused. My question is: how to disable interactive keypresses on grub booting?

This is for ubuntu 18.04 server of text mode, root autologin is set in getty service.

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