are many users who migrate from Windows to Linux platform, and Ubuntu mostly. Have long helped in ubuntu-es.org and to the huge amount of times I've had to repeat this, I decided to create an entry just for this. Yes, here I will explain in chapter and verse.
The problem: We had ubuntu installed and then (either repair or planning) install Windows. It happens that Windows is very accustomed to camp alone for a hard drive, even more for your MBR, and inevitably tramples every time a facility is walking by those dollars. Things in life. 
What has happened to our Ubuntu (or GNU / Linux)? Well do not be scared, because nothing happened at all, is still intact (wherever you are ...) Solution: Reinstalling Grub in the MBR of the hard disk.
need: A Live CD of Ubuntu.
1 - Introduce the Ubuntu LiveCD in the drive, turn on your machine and boot from the LiveCD, let it all flow quietly until you see the classic desktop of a pristine Ubuntu.
2 - Open a console
Theory:
Before typing anything on the console as an organization must understand GNU / Linux drives and partitions.
Write in console: sudo fdisk-l You should have something like this: (quietly, in your machine will have two or three lines, alo most)
Each unit that detects USB or SATA, is released into the devices directory "/ dev". Under the name "sd" + a letter. The letter corresponds to the number of unity, "a" for the first, "b" for the second ... etc.
addition, the above is assigned a number for each partition detected in the unit, so that the first partition on the disk will be "sda1" The second partition of first disk will be 2 (sda2) the second partition second disk will be "sdb2." I guess you imagine where the shots go.
And all these units are located files in / dev. "
3 - Identify where you installed Ubuntu:
Well how do we know which device is our record of ubuntu? Easy, the first of which is Linux file system. In this case it is / dev/sda5. In yours will be 1 or 2 or 3, it depends.
In console write: sudo mount / dev/sda5 / mnt (do not return anything) 4 - Restoring Grub
In the same console type: sudo grub-install - root-directory = / mnt / dev / sda
And everything ready, no more history, restart your computer and enjoy GNU !
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