Assuming you would like to know how to exit the GNU GRUB rescue shell, there are a few ways to do this.
One way is to simply reboot your system. This can be done by typing in the command "reboot" and pressing Enter.
If you want to exit without rebooting, you can type in the command "exit" and press Enter. This should get you to the GNU GRUB menu, where you can select the operating system you want to boot.
If you are still in the rescue shell after trying the above methods, you can try typing in the commands "insmod normal" and "normal". This should load the normal module and give you the ability to boot your operating system.
If you are still having trouble, you can try looking up your specific model of computer online to see if there are any other methods that might work for you.
