I’ve had a weird issue. My Kubuntu install would never start Xorg. I could boot to recovery, then make it “resume normal boot”. But it would never boot on its own. I pinned the issue on graphics drivers.



My Graphics Processor is Nvidia GeForce 8400 GS



Driver download page

Latest Ubuntu 32 bit display driver (as of Jan 23, 2012)



This downloads a 32 MB executable file NVIDIA-Linux-x86-290.10.run

Boot to Ubuntu recovery, navigate to the folder containing NVIDIA-Linux-x86-290.10.run



First install binaries required to rebuild kernel:



sudo apt-get install build-essential[/code]



Then install the driver:

sh NVIDIA-Linux-x86-290.10.run[/code]


Now you can start X with:

sudo /etc/init.d/kdm start[/code]


Add Nvidia module to start with

kdesudo kate /etc/modules[/code]

Add a line "nvidia" on a new line
Once Nvidia drivers are installed, you can configure them with:

kdesudo nvidia-settings[/code]

For more instructions, refer the following: