DA授权后台是没有Unbuntu选项的，Ubuntu和Debian对应起来即可。
可以通过http://www.debian.org/releases/查看现在Debian发行版最新情况。

If my memory is correct, any Ubuntu version after (and including) 11.10 uses Debian 7, thus it’s not yet supported.Versions 9 and 10 (for the most part) use Debian 5, so things in betwen (prior to 11.10) would use Debian 6.If unsure, just install?Debian 6. Check the /etc/debian_version prior to installation.

如果内存允许，11.10（包含）以后的Ubuntu，都可以和Debian7对应，但是目前不支持Debian7；Ubutu9和Ubuntu10，和Debian5对应，Ubuntu9(10)到Ubuntu11.10之间的Ubuntu和Debian6对应。