In digging through ubiquity, it looks like ubiquity hands off control to jockey via dbus, and it seems jockey runs into trouble. In the log it seems jockey is unable to find (or create?) it's cache, and so I wonder if that may be what's steering it off the cliff.
** Package changed: ubiquity (Ubuntu Precise) => jockey (Ubuntu Precise) -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to nvidia-graphics-drivers in Ubuntu. https://bugs.launchpad.net/bugs/876499 Title: Incorrect Nvidia driver installed by checking 3rd party box To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/jockey/+bug/876499/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : ubuntu-x-swat@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp