Lately i have moved from Ubuntu 32bit to 64bit to make use of the 8G memory, and since I have been struggling to get our juniper vpn connection working, turned out it is not compatible with 64bit binaries of java and firefox.
I found this great tutorial here to have the juniper network VPN working from command line http://mad-scientist.us/juniper.html
the only disadvantage of this is you won’t have a status window to monitor the connection activity.
This has been tested on Ubuntu 10.10 maverick.