My other operating system has vanished even after running boot-repair

Question

After installing Lubuntu, I have never found a dual boot option, so I ran boot-repair.

I've got 2 updates and one is good and the other is extremely bad:

The Good One: I can see the dual boot options now.

The Bad One: I can't see my other operating system, it's just Ubuntu.

Output of parted --list

Here is the output of the commands:

sudo os-prober
sudo update-grub

Answer 1

Try running this command to detect other operating systems:

sudo os-prober

and then this to update grub:

sudo update-grub

Answer 2

I solved it by formatting my device and then installed windows xp and ubuntu instead of windows 7 and lubuntu, since lubuntu has that kind of problems ..