Editing grub?

[Mohamad.1996]

Hi friends. I wanted to use another kernel for loading but here I've got this!!!
you know I wanted to use another kernel every command I typed showed not found
I did these things: in liunx debian 10
grub-install /dev/sda
or grub2-install /dev/sda
all of them showed command not found
and also this grub-mkconfig > /boot/grub/grub.cfg
showed not found
and typed reboot
and after that showed this. I will send you video let's see this image

 

[Peer]

Do this:

Classic SysAdmin: How to Rescue a Non-booting GRUB 2 on Linux - Linux Foundation

Once upon a time we had legacy GRUB, the Grand Unified Linux Bootloader version 0.97. Learn how to rescue a non-booting GRUB 2 on Linux.

www.linux.com

When you booted into the os give in: grub-mkconfig -o /boot/grub/grub.cfg