kernel module fails to compile on 2.6.35

[JR]

after upgrading from 10.4 to 10.10 beta i had several issues with the fglrx drivers (dpkg-divert related). I managed to uninstall all *fglrx* packages and reinstalled them again.

the installation reports:
Error! Bad return status for module build on kernel: 2.6.35-20-generic (x86_64)
Consult the make.log in the build directory
/var/lib/dkms/fglrx/8.723.1/build/ for more information.
dpkg: error processing fglrx (--configure):
 subprocess installed post-installation script returned error exit status 10
dpkg: dependency problems prevent configuration of fglrx-amdcccle:
 fglrx-amdcccle depends on fglrx; however:
  Package fglrx is not configured yet.
dpkg: error processing fglrx-amdcccle (--configure):
 dependency problems - leaving unconfigured
...

the make.log says:

DKMS make.log for fglrx-8.723.1 for kernel 2.6.35-20-generic (x86_64)
Wed Sep 8 00:16:12 CEST 2010
AMD kernel module generator version 2.1
cat: /lib/modules/2.6.35-20-generic/build/include/linux/utsrelease.h: No such file or directory
Error:
kernel includes at /lib/modules/2.6.35-20-generic/build/include do not match current kernel.
they are versioned as ""
instead of "2.6.35-20-generic".
you might need to adjust your symlinks:
- /usr/include
- /usr/src/linux

ProblemType: Bug
DistroRelease: Ubuntu 10.10
Package: fglrx 2:8.723.1-0ubuntu4
ProcVersionSignature: Ubuntu 2.6.35-20.29-generic 2.6.35.4
Uname: Linux 2.6.35-20-generic x86_64
Architecture: amd64
DRM.card0.HDMI_Type_A.1:
 status: disconnected
 enabled: disabled
 dpms: On
 modes:
 edid-base64:
DRM.card0.LVDS.1:
 status: connected
 enabled: enabled
 dpms: On
 modes: 1920x1080 1680x1050 1400x1050 1280x1024 1440x900 1280x960 1280x854 1280x800 1280x720 1152x768 1024x768 800x600 848x480 720x480 640x480
 edid-base64: AP///////wAGr+0QAAAAAAESAQOQIhN4CsiVnldUkiYPUFQAAAABAQEBAQEBAQEBAQEBAQEBgDSAPnA4MkAeFKoAWMEQAAAagDSAPnA4MkAeFKoAWMEQAAAaAAAA/gBGNzkwS4BCMTU2SFcxAAAAAAAAAAAAAAAAAAIBCiAgANU=
DRM.card0.VGA.1:
 status: disconnected
 enabled: disabled
 dpms: On
 modes:
 edid-base64:
Date: Wed Sep 8 00:18:29 2010
DkmsStatus: fglrx, 8.723.1: added
GdmLog: Error: command ['kdesudo', '--', 'cat', '/var/log/gdm/:0.log'] failed with exit code 1: cat: /var/log/gdm/:0.log: No such file or directory
GdmLog1: Error: command ['kdesudo', '--', 'cat', '/var/log/gdm/:0.log.1'] failed with exit code 1: cat: /var/log/gdm/:0.log.1: No such file or directory
GdmLog2: Error: command ['kdesudo', '--', 'cat', '/var/log/gdm/:0.log.2'] failed with exit code 1: cat: /var/log/gdm/:0.log.2: No such file or directory
InstallationMedia: Kubuntu 9.10 "Karmic Koala" - Release amd64 (20091027)
Lsusb:
 Bus 002 Device 002: ID 8087:0020 Intel Corp. Integrated Rate Matching Hub
 Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
 Bus 001 Device 003: ID 0c45:6417 Microdia
 Bus 001 Device 002: ID 8087:0020 Intel Corp. Integrated Rate Matching Hub
 Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
MachineType: Dell Inc. Studio 1557
ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.35-20-generic root=UUID=7ecb4470-8ac5-470e-a220-b9d8c996f2f3 ro quiet splash
ProcEnviron:
 LANGUAGE=
 PATH=(custom, user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: fglrx-installer
dmi.bios.date: 10/06/2009
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A02
dmi.board.name: 0KM426
dmi.board.vendor: Dell Inc.
dmi.board.version: A02
dmi.chassis.type: 8
dmi.chassis.vendor: Dell Inc.
dmi.chassis.version: A02
dmi.modalias: dmi:bvnDellInc.:bvrA02:bd10/06/2009:svnDellInc.:pnStudio1557:pvrA02:rvnDellInc.:rn0KM426:rvrA02:cvnDellInc.:ct8:cvrA02:
dmi.product.name: Studio 1557
dmi.product.version: A02
dmi.sys.vendor: Dell Inc.
glxinfo: Error: [Errno 2] No such file or directory
system:
 distro: Ubuntu
 codename: maverick
 architecture: x86_64
 kernel: 2.6.35-20-generic