Spider,
I know to little about Ubuntu to make a correct decision. You mentioned in the beginning that it was available but it wouldn't install anything.
According to the folk's at #ubuntu on freenode it's available:
http://packages.ubuntu.com/search?keywords=librecadSo perhaps there is something going on on your workstation, do let us know if the installation instructions on Librecad.org worked for you.
Ries