package nvidia-settings 270.29-0ubuntu1 failed to install/upgrade: unable to securely remove '/usr/share/doc/nvidia-settings.dpkg-tmp': Read-only file system

I got this message after salvaging my Ubuntu Desktop 11.04.

My troubles started when I installed a new NVIDIA Graphic card in my system. System won't boot, either from my SSD or LiveCD.

To salvage the system , I had to remove the board from my system, reboot with my 11.04 Live CD which then work because my system was defaulting to my Intel Intel Integrated Graphics processor (I have an Intel i7 2600 processor).

Then, from that Ubuntu, I chrooted to my SSD root partition, rename /dev/null and run "apt-get install nvidia-current", shutdown the Live CD.

Finally, I put back my NVIDIA board and boot from SSD. The booted but only thing was that message.

Is there anything I sould do about this message?

P.S. I went to /usr/share/doc/nvidia-settings and the dpkg-tmp file was not there.

ProblemType: Package
DistroRelease: Ubuntu 11.04
Package: nvidia-settings 270.29-0ubuntu1
ProcVersionSignature: Ubuntu 2.6.38-13.54-generic 2.6.38.8
Uname: Linux 2.6.38-13-generic x86_64
NonfreeKernelModules: nvidia
AptOrdering:
 nvidia-current: Install
 nvidia-settings: Install
 nvidia-current: Configure
 nvidia-settings: Configure
Architecture: amd64
Date: Sat Feb 11 10:23:11 2012
Df:
 Filesystem 1K-blocks Used Available Use% Mounted on
 /dev/sda5 14417392 3910764 9774264 29% /
 none 8173724 228 8173496 1% /dev
 none 8173724 228 8173496 1% /dev/pts
DpkgTerminalLog: Can not write log, openpty() failed (/dev/pts not mounted?)
ErrorMessage: unable to securely remove '/usr/share/doc/nvidia-settings.dpkg-tmp': Read-only file system
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release amd64 (20110427.1)
SourcePackage: nvidia-settings
Title: package nvidia-settings 270.29-0ubuntu1 failed to install/upgrade: unable to securely remove '/usr/share/doc/nvidia-settings.dpkg-tmp': Read-only file system
UpgradeStatus: No upgrade log present (probably fresh install)