X server doesn't work on Ubuntu 14.04. What may be happening?

This how I used to setup my X Server on Ubuntu 13.

apt-get update
apt-get upgrade

# nvidia
apt-get -y install nvidia-current
apt-get -y install nvidia-current-updates

# x server
apt-get -y install xserver-xorg
apt-get -y install x11-xserver-utils

export DISPLAY=localhost:0.0

X :0 &
xhost +

On Ubuntu 14, I am getting the following error when I do X :0:

[  3491.124] (II) Module wfb: vendor="X.Org Foundation"
[  3491.124]    compiled for 1.15.1, module version = 1.0.0
[  3491.124]    ABI class: X.Org ANSI C Emulation, version 0.4
[  3491.124] (II) Loading sub module "ramdac"
[  3491.124] (II) LoadModule: "ramdac"
[  3491.124] (II) Module "ramdac" already built-in
[  3491.125] (**) NVIDIA(0): Depth 24, (--) framebuffer bpp 32
[  3491.125] (==) NVIDIA(0): RGB weight 888
[  3491.125] (==) NVIDIA(0): Default visual is TrueColor
[  3491.125] (==) NVIDIA(0): Using gamma correction (1.0, 1.0, 1.0)
[  3491.125] (**) NVIDIA(0): Enabling 2D acceleration
[  3491.569] (II) NVIDIA(0): NVIDIA GPU GeForce GTX 650 Ti (GK106) at PCI:1:0:0 (GPU-0)
[  3491.569] (--) NVIDIA(0): Memory: 2097152 kBytes
[  3491.569] (--) NVIDIA(0): VideoBIOS: 80.06.3c.00.11
[  3491.569] (II) NVIDIA(0): Detected PCI Express Link width: 16X
[  3491.569] (--) NVIDIA(0): Interlaced video modes are supported on this GPU
[  3491.572] (--) NVIDIA(0): Valid display device(s) on GeForce GTX 650 Ti at PCI:1:0:0
[  3491.572] (--) NVIDIA(0):     CRT-0
[  3491.572] (--) NVIDIA(0):     DFP-0
[  3491.572] (--) NVIDIA(0):     DFP-1
[  3491.572] (--) NVIDIA(0): CRT-0: 480.0 MHz maximum pixel clock
[  3491.572] (--) NVIDIA(0): DFP-0: 165.0 MHz maximum pixel clock
[  3491.573] (--) NVIDIA(0): DFP-0: Internal Single Link TMDS
[  3491.573] (--) NVIDIA(0): DFP-1: 330.0 MHz maximum pixel clock
[  3491.573] (--) NVIDIA(0): DFP-1: Internal Single Link TMDS
[  3491.573] (EE) NVIDIA(0): Failed to assign any connected display devices to X screen 0
[  3491.598] (EE) NVIDIA(0): Failing initialization of X screen 0
[  3491.782] (II) UnloadModule: "nvidia"
[  3491.782] (II) UnloadSubModule: "wfb"
[  3491.782] (II) UnloadSubModule: "fb"
[  3491.782] (EE) Screen(s) found, but none have a usable configuration.
[  3491.782] (EE) 
Fatal server error:
[  3491.782] (EE) no screens found(EE) 

What else can be done?

Solution 1:

I found the final solution here: http://www.nvidia.com.br/download/driverResults.aspx/69539

There's an item it says:

• Add a new option, AllowEmptyInitialConfiguration, which allows the X server to start even if no connected display devices are detected at startup. This option can be enabled by running "sudo nvidia-xconfig --allow-empty-initial-configuration"

So I did:

sudo nvidia-xconfig --allow-empty-initial-configuration

And it worked.

It happened because this is a server and in fact it doesn't have any display device connected.

Also, before it I followed the advice of bodhi.zazen. I blocked the nouveau drivers [and other stuff I think]

I added to /etc/modprobe.d/blacklist.conf

blacklist vga16fb
blacklist nouveau
blacklist rivafb
blacklist nvidiafb
blacklist rivatv

Then I rebooted, reinstalled the NVDIA drivers... and rebooted again!