331 updates installed after x session failed to launch. Was built against previous kernel version

[SimonOR]

I have an old twin Xeon (2 physical CPU) box running via an Nvidia 260 into a 40" TV using HDMI.
It's a media centre.
Yesterday there was a repeated failure to launch.
From CLI I installed 331-updates (Wasn't sure what -current would give me), and these built against yesterday's Kernel version.
After stock updates installed today, 331-updates snagged due to the new Kernel.
I could reinstall 331-updates which would probably fix the apport indication, but for the time being graphics is still functioning normally.
I'm told Nouveau is better than it used to be, but it's been a disappointment previously(13.10).

ProblemType: Package
DistroRelease: Ubuntu 14.10
Package: nvidia-331-updates-uvm 331.89-0ubuntu5
ProcVersionSignature: Ubuntu 3.16.0-25.33-generic 3.16.7
Uname: Linux 3.16.0-25-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.14.7-0ubuntu8
Architecture: amd64
DKMSKernelVersion: 3.16.0-25-generic
Date: Wed Nov 26 19:52:54 2014
InstallationDate: Installed on 2014-04-18 (222 days ago)
InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
PackageVersion: 331.89-0ubuntu5
SourcePackage: nvidia-graphics-drivers-331-updates
Title: nvidia-331-updates-uvm 331.89-0ubuntu5: nvidia-331-updates-uvm kernel module failed to build
UpgradeStatus: Upgraded to utopic on 2014-11-06 (19 days ago)