QLandkarteGT and Ubuntu 12.04

Hello, I have installed QLandkarte GT under Ubuntu 12.04. The version in the official repository is 1.2.3., when the last one is the 1.4.1. Please, does anyone know how updating the 1.2.3 rel. to the 1.4.1. or in any case installing the latest release?

Thank you very much