From the package list it looks like you are using Ubuntu 10.04 LTS (Lucid Lynx), so you may want to upgrade to:
- The current long term support (LTS) release: Ubuntu 12.04 LTS (Precise Pangolin)
- The current release: Ubuntu 13.10 (Saucy Salamander)
Or wait for the next LTS to become available, Ubuntu 14.04 (Trusty Tahr), in April 2014. The Ubuntu LTS releases are supported for five years, so you will want to upgrade soon in any case so you might want to get that out of the way.