[SOLVED] GRUB2 not seeing old distro when new distro is installed

Higgsboson · 01-12-2015, 04:19 PM

I have an old debian distro installed on hard disk. The distro is on sda1 partition. I also have Win7 on a seperate hard disk which is on sdb1.
When I boot up, GRUB bootloader opens up and gives me the option to select either OS.

So I recently installed a new debian distro and put into my sda2 partition.
But now when I boot up, GRUB only sees the new distro in sda2 and I can't access the distro in sda1 or Win7 in sdb1.

On one thread someone said mounting the partitions and then using 'update-grub' will resolve the problem.
I tried it and re-booted, but GRUB still only offers the newly installed distro in sda2.

Can someone help please?

syg00 · 01-12-2015, 04:37 PM

grub relies on os-prober to do the scanning for other operating systems - if os-prober is present, update-grub will call it. Make sure it is installed on the new system.

Higgsboson · 01-12-2015, 04:58 PM

Quote:

Originally Posted by syg00

grub relies on os-prober to do the scanning for other operating systems - if os-prober is present, update-grub will call it. Make sure it is installed on the new system.

Ok, I have installed os-prober, run it and then updated grub as you've said:

Code:

apt-get update
apt-get install os-prober
os-prober
update-grub

This has completely sorted out my problem!
Thank you very much!