On the SDK downloads page it states:
Linux® (openSUSE™ 11.*, Ubuntu® 10.0*, Red Hat® Enterprise Linux® 6.*)
which would mean 10.04. When looking at the systems requirement page it says:
Ubuntu® 11.04 (32-bit/64-bit)?????
So which is it? I would seem logical to keep developing for the 10.04 LTS version
because of longer support and a stable OS platform (I hope).