I have a puzzle of a problem. Upon booting, the existing grub menu shows the Debian OS, but I also have Ubuntu installed on the same hard disk. It does not show in the menu. Previously I had Debian, Ubuntu, and Mint. In Ubuntu config file (menu.lst) I wanted to delete Mint and an old Ubuntu. I did so. In doing this I must have removed the 'full' menu.lst,leaving only Debian. So now I cannot boot into the new Ubuntu. I presently have only two OS on the hard disk:
Debian and Ubuntu. I cant see Ubuntu, How do I correct this problem?