Oh no! Automatic updates for Ubuntu 10.04 Desktop stop in April (updates for 10.04 Server continue for two more years). Desktop users need to consider whether they’ll upgrade to Ubuntu 12.04 LTS, which will receive updates for both Desktop and Server through 2017. This handy chart diagrams the situation. You can directly upgrade 10.04 (and 11.10) to 12.04, as explained here. Canonical’s policy is that you get at least 18 months of updates for both Desktop and Server, and — starting with 12.04 LTS — 5 years of support for both desktop and server for LTS (Long Term Support) editions.