Aladdin has their own software though I don't know what it entails, search for "eToken_PKI_Client_for_Linux_v3_65.rar". Debian using pscd, opensc, openct, and etoken-pro-support supports the Aladdin eToken PRO 32/
64k. I don't know about Ubuntu. Make sure before you install the software you check the maintainers websites for any security updates. It would be appreciated if you post back if and how you got the token to work correctly.