Probe Current sda Disk and Install GRUB. Debian 12. Part.1.

Probe every OS in sda:

lsblk

sda      8:0    0 476.9G  0 disk
├─sda1   8:1    0   100M  0 part /media/DISK1
├─sda2   8:2    0    16M  0 part
├─sda3   8:3    0 219.4G  0 part /media/disk3
├─sda4   8:4    0   5.9G  0 part /media/disk4
├─sda5   8:5    0   644M  0 part /media/disk5
├─sda6   8:6    0  19.1G  0 part /media/disk6
├─sda7   8:7    0  93.1G  0 part /media/disk7
│                                /
├─sda8   8:8    0   135G  0 part /media/disk8
└─sda9   8:9    0   3.7G  0 part

Instructions to Install GRUB

To probe all operating systems on sda, install GRUB, and make it recognize every OS on sda, follow these steps:

Step 1: Install GRUB

sudo apt update
sudo apt install -y grub-pc

Step 2: Install GRUB to sda

sudo grub-install /dev/sda

Step 3: Probe for Operating Systems and Update GRUB

This command will detect all operating systems and generate the GRUB configuration file with entries for each detected OS.

sudo update-grub

After running these commands, GRUB will recognize every OS on sda and update the boot menu accordingly. You can verify the changes by rebooting and checking the GRUB menu.