I just configured the gogo client on my Ubuntu Maverick and everything works like a charm.
Here is a short guide on how to set up the client on Ubuntu:
1. first install the client with sudo apt-get install gogoc (the tspc is deprecated)
2. modify the config file from /etc/gogoc/gogoc.conf with sudo nano -w /etc/gogoc/gogoc.conf.
Locate and modify the following lines:
3. start the gogo client with sudo /etc/init.d/gogoc start and you are ready to go.
4. try a ping to ipv6.google.com (ping6 ipv6.google.com)
Hope this is usefull.
If you are interested in IPv6 connectivity and stuff go to gogo6.com IPv6 community