After my old card (GF 7100gs) burned, I switched to a new one (GF 8600 gts). After it the display runs in low resolution mode. I surfed Internet and this forum and tried everything. Downloaded official Nvidia driver 256.53, deleted all previous nvidia installations (sudo apt-get remove --purge nvidia-*) and in recovery mode tried to install it: sudo sh nvidia.run (I renamed it). But it failed with an error:
Code:
ERROR: If you are using a Linux 2.4 kernel, please make sure
       you either have configured kernel sources matching your
       kernel or the correct set of kernel headers installed
       on your system.
       
       If you are using a Linux 2.6 kernel, please make sure
       you have configured kernel sources matching your kernel
       installed on your system. If you specified a separate
       output directory using either the "KBUILD_OUTPUT" or
       the "O" KBUILD parameter, make sure to specify this
       directory with the SYSOUT environment variable or with
       the equivalent nvidia-installer command line option.
       
       Depending on where and how the kernel sources (or the
       kernel headers) were installed, you may need to specify
       their location with the SYSSRC environment variable or
       the equivalent nvidia-installer command line option.
ERROR: Installation has failed.  Please see the file
       '/var/log/nvidia-installer.log' for details.  You may find suggestions
       on fixing installation problems in the README available on the Linux
       driver download page at www.nvidia.com.
I tried also to install several versions of drivers offered thru Synaptic, the last one was nvidia 185 version. In System -> Administration -> Device drivers the driver after installation is written as activated but not in use. nvidia-xconfig command produces always such xorg.conf:
Code:
# nvidia-xconfig: X configuration file generated by nvidia-xconfig
# nvidia-xconfig:  version 260.19.06  (buildmeister@builder101)  Mon Sep 13 07:06:38 PDT 2010


Section "ServerLayout"
    Identifier     "Layout0"
    Screen      0  "Screen0" 0 0
    InputDevice    "Keyboard0" "CoreKeyboard"
    InputDevice    "Mouse0" "CorePointer"
EndSection

Section "Files"
EndSection

Section "InputDevice"

    # generated from default
    Identifier     "Mouse0"
    Driver         "mouse"
    Option         "Protocol" "auto"
    Option         "Device" "/dev/psaux"
    Option         "Emulate3Buttons" "no"
    Option         "ZAxisMapping" "4 5"
EndSection

Section "InputDevice"

    # generated from default
    Identifier     "Keyboard0"
    Driver         "kbd"
EndSection

Section "Monitor"
    Identifier     "Monitor0"
    VendorName     "Unknown"
    ModelName      "Unknown"
    HorizSync       28.0 - 33.0
    VertRefresh     43.0 - 72.0
    Option         "DPMS"
EndSection

Section "Device"
    Identifier     "Device0"
    Driver         "nvidia"
    VendorName     "NVIDIA Corporation"
EndSection

Section "Screen"
    Identifier     "Screen0"
    Device         "Device0"
    Monitor        "Monitor0"
    DefaultDepth    24
    SubSection     "Display"
        Depth       24
    EndSubSection
EndSection
Nvidia settings offer only two resolutions, first starts with 600 something by something (very low). And in recovery mode commands such X -configure and startx end with fatal error, in log there is written that no screens detected.

Ubuntu's kernel version is: 2.6.32-23-generic

Please help, in what direction should I move to make my new card working under Ubuntu? In Vista it's working just fine (in case you would think that it's card problem).