I have dual boot with Ubuntu and Windows 7. I needed to reinstall W7 and after that I reinstalled grub so that I could access both Ubuntu and W7.
Unfortunately my GRUB menu doesn't show W7. I tried update-grub, I also tried os_prober and then update-grub. I also tried boot-repair, but none of these seemed to work. Here is my bootinfoscript output:
I noticed that the script lines from the os_prober are not inserted in the grub script file at all. Maybe there is an error in the file:
/etc/grub.d/30_os_prober
It normally should show itself even if no other os is detected. You could purge grub-common and reinstall it, but maybe it is more safe to download grub-common.deb and just take the file from there. If you run
sudo grub-mkconfig | grep prober
you should see the script beginning and ending. If this is not working no matter if your windows boot works or not, it will not show up.
So the problem was really with os_prober. Some time ago I was messing with grub configuration and I moved file 30_os_prober in the grub.d directory to another location and I don't even remember why I did so.
After moving it back to its rightful place and running
sudo grub-mkconfig and then sudo update-grub it works fine :)
Thank you all for your responses!! It was very helpful!!
