Installed the debs, booted the new kernel, reinstalled nvidia-304.
The nvidia module built ok, but I was stuck in low graphics mode because the nvidia module didn't load properly.
So back to nouveau for now.
...Nov 22 22:54:12 trusty-64 kernel: [ 23.421709] tg3 0000:3f:00.0 eth0: Flow control is off for TX and off for RX
Nov 22 22:54:23 trusty-64 kernel: [ 34.674719] nvidia: Unknown symbol acpi_os_wait_events_complete (err 0)
Nov 22 22:54:23 trusty-64 kernel: [ 35.020818] nvidia: Unknown symbol acpi_os_wait_events_complete (err 0)
paul@trusty-64:~$ uname -a
Linux trusty-64 3.13.0-031300rc1-generic #201311221535 SMP Fri Nov 22 20:36:51 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux