installation fails with "This module/version has already been built"

Setting up nvidia-current (195.36.24-0ubuntu1~10.04) ...
update-initramfs: deferring update (trigger activated)
update-initramfs: Generating /boot/initrd.img-2.6.31-22-server
Cannot find /lib/modules/2.6.31-22-server
update-initramfs: failed for /boot/initrd.img-2.6.31-22-server
Removing old nvidia-current-195.36.24 DKMS files...

-------- Uninstall Beginning --------
Module: nvidia-current
Version: 195.36.24
Kernel: 2.6.32-23-generic (i686)
-------------------------------------

Status: Before uninstall, this module version was ACTIVE on this kernel.

nvidia-current.ko:
 - Uninstallation
   - Deleting from: /lib/modules/2.6.32-23-generic/updates/dkms/
 - Original module
   - No original module was found for this module on this kernel.
   - Use the dkms install command to reinstall any previous module version.

depmod....

DKMS: uninstall Completed.

------------------------------
Deleting module version: 195.36.24
completely from the DKMS tree.
------------------------------
Done.
Loading new nvidia-current-195.36.24 DKMS files...
First Installation: checking all kernels...
Building for 2.6.31-22-server and 2.6.32-23-generic
Building for architecture i686
Module build for the currently running kernel was skipped since the
kernel source for this kernel does not seem to be installed.
Module build for the currently running kernel was skipped since the
kernel source for this kernel does not seem to be installed.
Module build for the currently running kernel was skipped since the
kernel source for this kernel does not seem to be installed.
Module build for the currently running kernel was skipped since the
kernel source for this kernel does not seem to be installed.
Module build for the currently running kernel was skipped since the
kernel source for this kernel does not seem to be installed.
Building initial module for 2.6.32-23-generic
Done.

nvidia-current.ko:
Running module version sanity check.
 - Original module
   - No original module exists within this kernel
 - Installation
   - Installing to /lib/modules/2.6.32-23-generic/updates/dkms/

depmod....

DKMS: install Completed.
Building initial module for 2.6.32-23-generic

Error! This module/version has already been built on: 2.6.32-23-generic
Directory: /var/lib/dkms/nvidia-current/195.36.24/2.6.32-23-generic/i686
already exists. Use the dkms remove function before trying to build again.
dpkg: error processing nvidia-current (--configure):
 subprocess installed post-installation script returned error exit status 3
Processing triggers for python-gmenu ...
Rebuilding /usr/share/applications/desktop.en_US.utf8.cache...
Processing triggers for initramfs-tools ...
update-initramfs: Generating /boot/initrd.img-2.6.32-23-generic
Processing triggers for python-support ...
Errors were encountered while processing:
 nvidia-current

ProblemType: Bug
DistroRelease: Ubuntu 10.04
Package: nvidia-current (not installed)
ProcVersionSignature: Ubuntu 2.6.31-22.60-server
Uname: Linux 2.6.31-22-server x86_64
Architecture: amd64
Date: Tue Jul 6 14:55:38 2010
DkmsStatus: Error: [Errno 2] No such file or directory
MachineType: Dell Inc. PowerEdge R710
ProcCmdLine: BOOT_IMAGE=/vmlinuz-2.6.31-22-server root=/dev/mapper/tassadar-root ro quiet splash
ProcEnviron:
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: nvidia-graphics-drivers
UdevDb: Error: [Errno 2] No such file or directory
XorgLog: Error: [Errno 2] No such file or directory: '/var/log/Xorg.0.log'
dmi.bios.date: 10/30/2009
dmi.bios.vendor: Dell Inc.
dmi.bios.version: 1.3.6
dmi.board.name: 0YDJK3
dmi.board.vendor: Dell Inc.
dmi.board.version: A02
dmi.chassis.type: 23
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.:bvr1.3.6:bd10/30/2009:svnDellInc.:pnPowerEdgeR710:pvr:rvnDellInc.:rn0YDJK3:rvrA02:cvnDellInc.:ct23:cvr:
dmi.product.name: PowerEdge R710
dmi.sys.vendor: Dell Inc.
system:
 distro: Ubuntu
 codename: lucid
 architecture: x86_64
 kernel: 2.6.31-22-server