[ubuntu-uk] 11.04 Natty Narwhal

[Alan Bell]

all the releases are releases, with new features and whole new versions
of stuff they contain. These get maintained, security patches and other
fixes get made to the releases for the support period of that release,
there is no service pack or patch tuesday type process, fixes get
released when ready.

https://wiki.ubuntu.com/Releases

The LTS releases tend to aim for long term supportability, with ends up
being a bit contradictory, sometimes using not the cutting edge version
of certain components because they might have to be changed a lot,
sometimes deliberately going for something that is only just ready so
not to have to support an obsolete architecture of something for a long
time.

Alan.