I start my computer and instead of Ubuntu 12.04 I get : error: file not found. grub rescue>
I have seen a number of topics regarding this, but nothing works for me. First of all, I can not use Ubuntu Live CD because I have no CD-ROM. I tried using USB Live CD, but computer doesn't see it at all. So, I can not use this option, and I see it is recomended often. I tried using some of the ways that I saw here but nothing helps, all commands eventually got back where I started. Also, BIOS is set to check the USB first, so that's not a problem. Because I saw a few answers indicating that authors of these questions could make such an oversight which is very unlikely.