I would like to ask for your help. I have problem with Ubuntu, Kubuntu related to not detecting Windows Vista in grub. I run update-grub or update-grub2 and see that on generated cfg there is Windows Vista, also when i use sudo os-prober the same list is being generated with Windows Vista but as soon as i reboot, see purple grub with available systems to boot, there is no Windows Vista.

I think that it is related to call 30_os-prober in /etc/default/grub or /etc/grub.d/ (im on Windows right now, can't check it). The only way of starting Windows is not from grub but by hitting F8 and selecting hard disk with it.

Could you help me? I tried to find a solution, few have the same problem but running os-prober in my case didn't helped at all.