how can I sync an updated package from Debian?

[Kai-Cheung Leung]

mono is already 1.9.1, which is updated in Debian Lenny

http://packages.debian.org/source/lenny/mono

However in Ubuntu it is still only 1.2.6, but it seems to be lack of
people to update mono and the original maintainer seems to be busy.

what is the proper procedure to sync the Debian 1.9.1 to Ubuntu and get it
accepted?

Thanks!