If you read the description of the 10.04 tag, it states

> The third Long Term Support (LTS) release of Ubuntu. Released April
> 2010, and no longer supported since May 2013.

Also this is out lined in the [asking section][1] of the help page.

Perhaps updating the tags for unsupported releases could be a simple solution to your issue, something like

 
> The third Long Term Support (LTS) release of Ubuntu. Released April
> 2010, and no longer supported since May 2013.
> This release of Ubuntu is [end of life][2] and no longer eligible for support on
> AskUbuntu

Do not use would not work, there are situations where the tag is valid, for example an upgrade from 10.04 to 12.04, would be on topic, as the current version is 12.04, but the tag is relevant because they upgraded from 10.04.


  [1]: https://askubuntu.com/help
  [2]: http://www.ubuntu.com/info/release-end-of-life