I have a Lenovo X201 which also has the Gobi 2000 and 12.10.
After I 1st installed Quantal a few days ago it actually picked up the card and connected using the BT Mobile sim I have installed.
Then I went to actually use it today the connection was no longer in the network applet dropdown....
I am assuming that the 1st time it worked was because the firmware had persisted from the previous windows install maybe....
Now I have it working again, what I did may help:
I had to add the thinkpad-extras ppa and install gobi-loader-tp.
In a terminal window (CTRL+ALT+T):
sudo add-apt-repository ppa:linrunner/thinkpad-extras
sudo apt-get update
sudo apt-get install gobi-loader-tp
I then downloaded and installed the lenovo driver package to a windows VM and got hold of the firmware files from the install.
Then had to play about with different firmwares from the choices until it worked.
One thing to be aware of is that you must have all 3 files (amss.mbn, apps.mbn, & UQCN.mbn) in the /lib/firmware/gobi dir. As mine for BT Mobile UK were split across 2 dirs (6 & UTMS).
Hope this helps.