Support for ubuntu 10.10 maverick meerkat end on April 10, 2012. This date was established when Ubuntu 10.10 Maverick Meerkat was released in october of 2010. This announcement on the Ubuntu Developer mailing list, Kate Stewart as Ubuntu Release Manager writes :
This note is just to confirm that the support period for Ubuntu 10.10 (Maverick Meerkat) formally ends on April 10, 2012 and Ubuntu Security Notices no longer includes information or updated packages for Ubuntu 10.10.
The supported upgrade path from Ubuntu 10.10 is via Ubuntu 11.04 (Natty Narwhal). Instructions and caveats for the upgrade may be found at https://help.ubuntu.com/community/NattyUpgrades. Note that upgrades to version 11.04 and beyond are only supported in multiple steps, via an upgrade first to 11.04, then to 11.10. Both Ubuntu 11.04 and Ubuntu 11.10 continue to be actively supported with security updates and select high-impact bug fixes. All announcements of official security updates for Ubuntu releases are sent to the ubuntu-security-announce mailing list, information about which may be found at https://lists.ubuntu.com/mailman/listinfo/ubuntu-security-announce.
Since its launch in October 2004 Ubuntu has become one of the most highly regarded Linux distributions with millions of users in homes, schools, businesses and governments around the world. Ubuntu is Open Source software, costs nothing to download, and users are free to customize or alter their software in order to meet their needs.
Also posted @ http://fridge.ubuntu.com/