For the current development release of Ubuntu, you want to sync 1.6.2-1 from Debian experimental.
For quantal, precise, and oneiric, you want 1.6.1-3 as uploaded to Debian unstable. I'm not sure if there are any Ubuntu-specific changes that need to be preserved in the patch you're carrying.
For lucid, you want either the package or the patch from the stable-security 1.4.12.1+dfsg-4+squeeze1 package.
For the current development release of Ubuntu, you want to sync 1.6.2-1 from Debian experimental.
For quantal, precise, and oneiric, you want 1.6.1-3 as uploaded to Debian unstable. I'm not sure if there are any Ubuntu-specific changes that need to be preserved in the patch you're carrying.
For lucid, you want either the package or the patch from the stable-security 1.4.12. 1+dfsg- 4+squeeze1 package.