package fglrx 2:8.723.1-0ubuntu5 failed to install/upgrade: subprocess new pre-installation script returned error exit status 1: No instances of fglrx module in the DKMS tree

CAElinux : poor graphical quality in Salome graphic screen. I tried to use drivers directly from ATI server ...
It's worth and i do not manage to go backward.
Best regards
Jean-Pierre

Removing fglrx ...
Removing all DKMS Modules

Error! There are no instances of module: fglrx
8.723.1 located in the DKMS tree.
Done.

ProblemType: Package
DistroRelease: Ubuntu 10.04
Package: fglrx 2:8.723.1-0ubuntu5
ProcVersionSignature: Ubuntu 2.6.32-30.59-generic 2.6.32.29+drm33.13
Uname: Linux 2.6.32-30-generic x86_64
NonfreeKernelModules: fglrx
AptOrdering:
 fglrx: Install
 fglrx-amdcccle: Install
 fglrx: Configure
 fglrx-amdcccle: Configure
Architecture: amd64
Date: Thu Apr 7 15:47:39 2011
ErrorMessage: subprocess new pre-installation script returned error exit status 1
GdmLog2:

InstallationMedia: CAELinux2010 - Release amd64
MachineType: System manufacturer System Product Name
ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.32-30-generic root=UUID=c2e34645-5e2a-4cf0-b569-3656e6f19760 ro quiet splash
SourcePackage: fglrx-installer
Title: package fglrx 2:8.723.1-0ubuntu5 failed to install/upgrade: subprocess new pre-installation script returned error exit status 1
XorgLogOld:

dmi.bios.date: 08/24/2010
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 1005
dmi.board.asset.tag: To Be Filled By O.E.M.
dmi.board.name: M4A87TD EVO
dmi.board.vendor: ASUSTeK Computer INC.
dmi.board.version: Rev 1.xx
dmi.chassis.asset.tag: Asset-1234567890
dmi.chassis.type: 3
dmi.chassis.vendor: Chassis Manufacture
dmi.chassis.version: Chassis Version
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr1005:bd08/24/2010:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKComputerINC.:rnM4A87TDEVO:rvrRev1.xx:cvnChassisManufacture:ct3:cvrChassisVersion:
dmi.product.name: System Product Name
dmi.product.version: System Version
dmi.sys.vendor: System manufacturer
system:
 distro: Ubuntu
 codename: lucid
 architecture: x86_64
 kernel: 2.6.32-30-generic