Persist commands typed to GRUB rescue

After deleting old Linux partitions in order to free space on hard disk, I got an error from GRUB:

error: no such partition

And then I saw a grub rescue> prompt. After googling around I found that in order to boot normally I have to type the following commands.

set prefix=(hd0,msdos5)/boot/grub
set root=(hd0,msdos5)
insmod /boot/grub/linux.mod
linux /vmlinuz root=/dev/sda5 ro
initrd /initrd.img
boot

Here is the boot info summary report created by Boot-Repair.

However, on each reboot I have to type this again. How can I tell to GRUB once and all what configuration file to use?

Solution 1:

Try these commands

sudo update-grub
sudo grub-install /dev/sda

If you want a graphical option, try boot-repair

sudo add-apt-repository ppa:yannubuntu/boot-repair && sudo apt-get update
sudo apt-get install -y boot-repair && boot-repair

enter image description here