Despite all the problems I had with Ubuntu updates over the last couple of years, I decided to update my work machine to Ubuntu 11.04 (“Natty Narwhal”). I expected problems and I wasn’t disappointed, after the upgrade I was left standing in the dark, without X.
Fortunately, the rest of the system worked, so I was able to log into the system via console. The log file in
/var/log/Xorg.0.log showed the following error message:
[ 161.049] (II) LoadModule: "nvidia" [ 161.049] (II) Loading /usr/lib/xorg/extra-modules/nvidia_drv.so [ 161.049] (II) Module nvidia: vendor="NVIDIA Corporation" [ 161.049] compiled for 4.0.2, module version = 1.0.0 [ 161.049] Module class: X.Org Video Driver [ 161.052] (EE) NVIDIA: Failed to load the NVIDIA kernel module. Please check your [ 161.052] (EE) NVIDIA: system's kernel log for additional error messages. [ 161.052] (II) UnloadModule: "nvidia" [ 161.052] (II) Unloading nvidia [ 161.052] (EE) Failed to load module "nvidia" (module-specific error, 0) [ 161.052] (EE) No drivers available. [ 161.052] Fatal server error: [ 161.052] no screens found [ 161.052]
After a bit of pondering I remembered that I was using a graphics driver from Ubuntu’s “restricted” repository for my nVidia 9500 GT. The upgrade process installed a new kernel (package
uname -r to see which kernel you’re running) but wasn’t able to rebuild the graphics driver kernel module because it neglected to install the matching header files (package
Here’s what I did:
sudo apt-get install linux-headers-2.6.38-8-generic-pae sudo dpkg-reconfigure nvidia-current
nvidia-current package recompiled the kernel module and after a reboot (just in case), my graphical login was back and things worked normally. At some point I also removed my
/etc/X11/xorg.conf and recreated it from scratch using
sudo nvidia-settings, but I don’t think this step was necessary.
The next problem I encountered was with my dual monitor setup (I’m using two monitors with a single graphics card). Unity didn’t let me place windows on the second screen for some stupid reason. Using the
nvidia-xconfig tool, I switched from “Separate X screen” configuration to “TwinView” and things worked again.