Lately, there are a lot of new Linux releases. Not only Ubuntu, others like Fedora and OpenSuSe as well too. You can upgrade your Ubuntu to the latest version even it is on beta release. But keep in mind that the beta version you are using.
I did had a post about how to upgrade a Ubuntu Server version. Anyway i repeat it again, iIf you have ubuntu 10.10 Lucid Lynx or older version of ubuntu installed and you want to upgrade to Ubuntu 10.10 Maverick Meerkat, you can do it by following these instructions:
For Desktop
1. Press Alt+F2.
2. Type in update-manager -d into the command box.
3. Check for updates, then Install them.
4. Finally click Upgrade to the New Ubuntu release 10.10.
For Server
1. install the update-manager-core package if it is not already installed:
$ sudo apt-get install update-manager-core
2. Edit /etc/update-manager/release-upgrades and set Prompt=normal;
3. To upgrade to a newer release, from a terminal prompt enter:
$ do-release-upgrade
4. It is also possible to use do-release-upgrade to upgrade to a development version of Ubuntu. To accomplish this use the -d switch:
$ do-release-upgrade -d
(then follow the on-screen instructions.)
Good Luck~


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