i can't work the Linux client

My xorg.conf, I use the lastest version of Ubuntu !
# nvidia-xconfig: X configuration file generated by nvidia-xconfig
# nvidia-xconfig: version 1.0 (buildmeister@builder3) Wed Nov 1 19:47:17 PST 2006
# /etc/X11/xorg.conf (xorg X Window System server configuration file)
#
# This file was generated by dexconf, the Debian X Configuration tool, using
# values from the debconf database.
#
# Edit this file with caution, and see the /etc/X11/xorg.conf manual page.
# (Type "man /etc/X11/xorg.conf" at the shell prompt.)
#
# This file is automatically updated on xserver-xorg package upgrades *only*
# if it has not been modified since the last upgrade of the xserver-xorg
# package.
#
# If you have edited this file but would like it to be automatically updated
# again, run the following command:
# sudo dpkg-reconfigure -phigh xserver-xorg
Section "ServerLayout"
Identifier "Default Layout"
Screen "Default Screen" 0 0
Screen "Default Screen1" RightOf "Default Screen"
InputDevice "Generic Keyboard"
InputDevice "Configured Mouse"
EndSection
Section "Files"
# paths to defoma fonts
FontPath "/usr/share/X11/fonts/misc"
FontPath "/usr/share/X11/fonts/cyrillic"
FontPath "/usr/share/X11/fonts/100dpi/:unscaled"
FontPath "/usr/share/X11/fonts/75dpi/:unscaled"
FontPath "/usr/share/X11/fonts/Type1"
FontPath "/usr/share/X11/fonts/CID"
FontPath "/usr/share/X11/fonts/100dpi"
FontPath "/usr/share/X11/fonts/75dpi"
FontPath "/var/lib/defoma/x-ttcidfont-conf.d/dirs/TrueType"
FontPath "/var/lib/defoma/x-ttcidfont-conf.d/dirs/CID"
EndSection
Section "Module"
Load "i2c"
Load "bitmap"
Load "ddc"
Load "extmod"
Load "freetype"
Load "glx"
Load "int10"
Load "type1"
Load "vbe"
EndSection
Section "InputDevice"
Identifier "Generic Keyboard"
Driver "kbd"
Option "CoreKeyboard"
Option "XkbRules" "xorg"
Option "XkbModel" "pc105"
Option "XkbLayout" "fr"
Option "XkbVariant" "latin9"
EndSection
Section "InputDevice"
Identifier "Configured Mouse"
Driver "mouse"
Option "CorePointer"
Option "Device" "/dev/input/mice"
Option "Protocol" "ImPS/2"
Option "Emulate3Buttons" "true"
Option "ZAxisMapping" "4 5"
EndSection
Section "Monitor"
Identifier "Écran générique"
HorizSync 28.0 - 64.0
VertRefresh 43.0 - 60.0
Option "DPMS"
EndSection
Section "Monitor"
Identifier "Écran générique1"
HorizSync 28.0 - 64.0
VertRefresh 43.0 - 60.0
Option "DPMS"
EndSection
Section "Device"
Identifier "NVIDIA Corporation NV28 [GeForce4 Ti 4200 AGP 8x]"
Driver "nvidia"
BusID "PCI:1:0:0"
EndSection
Section "Screen"
Identifier "Default Screen"
Device "NVIDIA Corporation NV28 [GeForce4 Ti 4200 AGP 8x]"
Monitor "Écran générique"
DefaultDepth 24
Option "sw_cursor"
Option "DPMS"
Option "TwinView"
Option "ConnectedMonitor" "crt, crt"
Option "SecondMonitorHorizSync" "28-64"
Option "SecondMonitorVertRefresh" "43-60"
Option "MetaModes" "1280x1024, 1280x1024;"
Option "TwinViewOrientation" "Right"
SubSection "Display"
Depth 1
Modes "1280x1024" "1152x864" "1024x768" "832x624" "800x600" "720x400" "640x480" "640x400" "640x350"
EndSubSection
SubSection "Display"
Depth 4
Modes "1280x1024" "1152x864" "1024x768" "832x624" "800x600" "720x400" "640x480" "640x400" "640x350"
EndSubSection
SubSection "Display"
Depth 8
Modes "1280x1024" "1152x864" "1024x768" "832x624" "800x600" "720x400" "640x480" "640x400" "640x350"
EndSubSection
SubSection "Display"
Depth 15
Modes "1280x1024" "1152x864" "1024x768" "832x624" "800x600" "720x400" "640x480" "640x400" "640x350"
EndSubSection
SubSection "Display"
Depth 16
Modes "1280x1024" "1152x864" "1024x768" "832x624" "800x600" "720x400" "640x480" "640x400" "640x350"
EndSubSection
SubSection "Display"
Depth 24
Modes "1280x1024" "1152x864" "1024x768" "832x624" "800x600" "720x400" "640x480" "640x400" "640x350"
EndSubSection
EndSection
Section "Screen"
Identifier "Default Screen1"
Device "NVIDIA Corporation NV28 [GeForce4 Ti 4200 AGP 8x]"
Monitor "Écran générique1"
DefaultDepth 24
SubSection "Display"
Depth 1
Modes "1280x1024" "1152x864" "1024x768" "832x624" "800x600" "720x400" "640x480" "640x400" "640x350"
EndSubSection
SubSection "Display"
Depth 4
Modes "1280x1024" "1152x864" "1024x768" "832x624" "800x600" "720x400" "640x480" "640x400" "640x350"
EndSubSection
SubSection "Display"
Depth 8
Modes "1280x1024" "1152x864" "1024x768" "832x624" "800x600" "720x400" "640x480" "640x400" "640x350"
EndSubSection
SubSection "Display"
Depth 15
Modes "1280x1024" "1152x864" "1024x768" "832x624" "800x600" "720x400" "640x480" "640x400" "640x350"
EndSubSection
SubSection "Display"
Depth 16
Modes "1280x1024" "1152x864" "1024x768" "832x624" "800x600" "720x400" "640x480" "640x400" "640x350"
EndSubSection
SubSection "Display"
Depth 24
Modes "1280x1024" "1152x864" "1024x768" "832x624" "800x600" "720x400" "640x480" "640x400" "640x350"
EndSubSection
EndSection