Well, Finally after think many times and days I decide to upgrade my Ubuntu Linux Hardy Heron 8.04 to Ubuntu Linux Intrepid Ibex 8.10. By default Ubuntu Linux 8.04 LTS will not offer a upgrade to 8.10. This is because the 8.04 LTS version is a long term support release and 8.10 is a regular release. Upgrades from 8.04 LTS to 8.10 are fully supported, of course, and easy to enable. Before you upgrade, better you read the upgrade notes and release notes in here and here. Please read carefully before do upgrade especially for the production desktop or server. [...]