How to install Ubuntu or dual boot Ubuntu

How to install Ubuntu on a system or dual boot Ubuntu along with Windows 7, Vistal or Xp. Here are the links that show how to install Ubuntu 11.10 and Ubuntu 11.04. Both the links follow the same process to install Ubuntu. But for readers convenience it is shown in two different post.

Install Ubuntu 11.10

Install Ubuntu 11.04

Trouble shooting after installing Ubuntu

The most common error one see after installing Ubuntu is Grub rescue or no such partition grub rescue.
This means that Ubuntu Linux grub has not been installed during Ubuntu installation and needs to be installed manually.
Grub can be rescued in two ways, either through Ubuntu Desktop CD or through Ubuntu server CD.
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