if your update manager isn't listing the upgrade to 9.10 it's possible your Apt config isn't pointing to the normal repos.
Ubuntu has two types of releases, standard and Long Term Support (or "LTS").Standard updates are released every six months and receive security updates from Ubuntu for at least nine months, while LTS updates are released every two years and are supported for at least five years.To avoid the nightmare, packaging scripts only in general support upgrading from the version of the package included in the previous Ubuntu release ( from the previous LTS release, in the case of a package included in an LTS release).Upgrading directly from the penultimate, or earlier, version to the current version (called a "skip upgrade) is possible, but is liable to result in a misconfigured system.Because it has attracted low-quality or spam answers that had to be removed, posting an answer now requires 10 reputation on this site (the association bonus does not count).
Would you like to answer one of these unanswered questions instead?
Just visit and download the appropriate torrent file for the alternate installation CD, found in the list towards the bottom of the page.
This directory contains the most frequently downloaded Ubuntu images.
If you are currently using Ubuntu 12.04, you will have security updates until at least October 2017.
If you want to extend that support time, and get access to new features and updates, you can upgrade your server to the newest LTS release.
This type of CD is what most people will want to use.