Comment 2 for bug 72771

I think this stems from a known issue with Ubuntu X configuration. Please see Ginn's blog for a fix:
http://www.chenqi.org/blog/archives/2006/06/howto_fix_gok_s.html

(Basically you have to manually comment out sections of your x config file)

If that link doesn't work:
http://gnomesupport.org/forums/viewtopic.php?t=11016
https://launchpad.net/distros/ubuntu/+source/wacom-tools/+bug/40473
https://launchpad.net/distros/ubuntu/+source/wacom-tools/+bug/40806
http://bugzilla.gnome.org/show_bug.cgi?id=350356

Hope this helps you.