If you’re running off a live USB disk or changing your graphics card the error below might appear when Xorg is looking for the wrong drivers or device. You might also get this error while using the Nvidia drivers, I found however this was caused by some of the extra options added into the xorg.conf file (usually located /etc/X11/xorg.conf). If the case is that it’s a problem with the aditional options I suggest making a backup of the file and attempting to comment out (#) aditional options, this will need a bit more of an expert eye to see what isn’t needed though.. You can also use the following to rollback to a working version when using the Nvidia drivers.
There is a pretty simple fix, if it is caused by broken or changed xorg.conf file:
Make a backup of your current Xorg.conf, just in case something goes even more wrong and it can be easily restored:
sudo cp /etc/X11/xorg.conf /etc/X11/xorg.bckup
Now you’ll want to restore the failsafe (sometimes called xorg.conf.backup) config to be used as the default:
sudo cp /etc/X11/xorg.conf.failsafe /etc/X11/xorg.conf
Yeah, it was that simple (if this error was caused by a broken or changed xorg.conf anyway. So you can continue and start the x server with:
X.Org X Server 1.9.0 Release Date: 2010-08-20 X Protocol Version 11, Revision 0 Build Operating System: Linux 2.6.24-27-server i686 Ubuntu Current Operating System: Linux ubuntu 2.6.35-22-generic #33-Ubuntu SMP Sun Sep 19 20:34:50 UTC 2010 i686 Kernel command line: noprompt cdrom-detect/try-usb=true persistent file=/cdrom/preseed/ubuntu.seed boot=casper initrd=/casper/initrd.lz quiet splash -- maybe-ubiquity Build Date: 16 September 2010 05:39:22PM xorg-server 2:1.9.0-0ubuntu7 (For technical support please see http://www.ubuntu.com/support) Current version of pixman: 0.18.4 Before reporting problems, check http://wiki.x.org to make sure that you have the latest version. Markers: (--) probed, (**) from config file, (==) default setting, (++) from command line, (!!) notice, (II) informational, (WW) warning, (EE) error, (NI) not implemented, (??) unknown. (==) Log file: "/var/log/Xorg.0.log", Time: Fri Mar 4 11:35:54 2011 (==) Using config file: "/etc/X11/xorg.conf" (==) Using system config directory "/usr/share/X11/xorg.conf.d" (EE) No devices detected. Fatal server error: no screens found Please consult the The X.Org Foundation support at http://wiki.x.org for help. Please also check the log file at "/var/log/Xorg.0.log" for additional information. ddxSigGiveUp: Closing log giving up. xinit: No such file or directory (errno 2): unable to connect to X server xinit: No such process (errno 3): Server error.