I had to use Juniper VPN but apparently it doesn’t work well from Linux machines. To complicate the matter even more the underlying VPN software is 32 bit, but I am running a 64bit OS.
I have outlined the setup steps here:
Although all these steps are specifically for Fedora 17/18 x86_64 bit OS, it should be easy to connect from Ubuntu machines too.
I hope it helps you.
EDIT:
I also came across these links for RPM based OSes:
EDIT2:
Latest official documentation is here - [SSL VPN/MAG] How to install the 32 bit Network Connect client on 64 bit Linux platforms