How to upgrade Ubuntu 12.10 wrongly installed

[GregTsar]

By my mistake, I did interrupt the 12.10 version installation process.
As a result, I got it without Dash. Which makes me unable to work normally.
So my Question of the Beginner:
HOW TO UPGRADE / REINSTALL THE SYSTEM?

[Mr_JMM]

You may have to reinstall using a dvd.