I'd like to access a grub prompt while booting an Ubuntu 12.04 ISO with Virtualbox.
When keeping the left Shift key pressed while booting, or when pressing
Esc, I get stuck in some weird prompt named
Here are some commands I tried:
boot: ls Could not find kernel image: ls boot: help Could not find kernel image: help boot: . Invalid or corrupt kernel image.
Enter (empty command) the system boots.
What is this prompt? What commands does it accept? How can I gain a grub prompt from this?