Dear Sir / Madam,
I noticed on the 'Software distributions based on Debian' page located at http://www.debian.org/misc/children-distros under the Ubuntu section it has mentioned that...
"...a commitment to security updates with 18 months of support for every release...".
I understand that the support cycle for non-LTS releases of Ubuntu have now been reduced to nine months (https://wiki.ubuntu.com/Releases). This may require an update of information provided in the Ubuntu section of the above mentioned page on the Debian site. However it may also require appropriate changes anywhere else Ubuntu's release cycle is referred to.
I hope this helps.
Thanks and Regards,