Updating Grub

@LinuxSearch said:
I'm trying to update the grub so i can have two OS on this machine! i'm trying to make appear a row on the grub entry and i'm no getting it! Here's some of the outputs that i'm getting:

sudo grub-install /dev/sda2

Installing for x86_64-efi platform.

Installation finished. No error reported.

sudo update-grub

Generating grub configuration file ...

Found linux image: /boot/vmlinuz-4.10.0-19-generic

Found initrd image: /boot/initrd.img-4.10.0-19-generic

Adding boot menu entry for EFI firmware configuration

done

 

sudo fdisk -l

Disk /dev/sda: 223,6 GiB, 240057409536 bytes, 468862128 sectors

Units: sectors of 1 * 512 = 512 bytes

Sector size (logical/physical): 512 bytes / 4096 bytes

I/O size (minimum/optimal): 4096 bytes / 4096 bytes

Disklabel type: dos

Disk identifier: 0x4f3e687f

Device     Boot   Start       End   Sectors   Size Id Type

/dev/sda1  *       2048   1026047   1024000   500M  7 HPFS/NTFS/exFAT

/dev/sda2       1026048 468858879 467832832 223,1G  7 HPFS/NTFS/exFAT

Disk /dev/sdb: 931,5 GiB, 1000204886016 bytes, 1953525168 sectors

Units: sectors of 1 * 512 = 512 bytes

Sector size (logical/physical): 512 bytes / 4096 bytes

I/O size (minimum/optimal): 4096 bytes / 4096 bytes

Disklabel type: gpt

Disk identifier: 639A1F6F-2B2A-40D4-896C-6CC8B9CA42C6

Device      Start        End    Sectors   Size Type

/dev/sdb1      34     262177     262144   128M Microsoft reserved

/dev/sdb2  264192 1953523711 1953259520 931,4G Microsoft basic data

Partition 1 does not start on physical sector boundary.

Disk /dev/sdc: 298,1 GiB, 320072933376 bytes, 625142448 sectors

Units: sectors of 1 * 512 = 512 bytes

Sector size (logical/physical): 512 bytes / 512 bytes

I/O size (minimum/optimal): 512 bytes / 512 bytes

Disklabel type: gpt

Disk identifier: C1341E80-9CF0-4A92-B4E1-BA5B04FB5415

Device       Start       End   Sectors   Size Type

/dev/sdc1     2048   1050623   1048576   512M EFI System

/dev/sdc2  1050624 625141759 624091136 297,6G Linux filesystem

I'm having a boot flag on dev/sda1, i'm viewing the files on it (i think)! i'm wondering if the boot flag is on the correct device! How can i add that disk to the grub menu on startup?

 

 

Thanks for this so much, was stuck but this cleared everything up.

Regards,
Shane