For anyone considering running something on top of 64-bit Ubuntu (esp. OpenVPN-ALS), be aware that Java still has a few bugs in it, when run on 64-bit. Firefox, when pointed at a OpenVPN-ALS site, is not able to start up the web forwarded windows. Instead, it just times out and then complains about not being able to synch. The apps on the server end run fine, as do the local apps in a 32-bit browser.
I get around this by running a 32-bit version of Ubuntu in a VM. It's still a bit cranky, but it works.