package nvidia-glx-185 not installed failed to install/upgrade: subprocess installed post-removal script returned error exit status 2

Actually I am in a process of installing fglrx driver and so I have removed everything related to nvidia, but it seems some parts are still in the system. Fglrx reported as installed but does not load (black screen). When booting through the safe mode the vesa driver gets loaded instead. I am happy to submit further logs etc. on request.

ProblemType: Package
AptOrdering:
 nvidia-glx-185: Remove
 nvidia-185-libvdpau: Purge
Architecture: amd64
Date: Sat Jul 9 21:23:46 2011
DistroRelease: Ubuntu 9.10
ErrorMessage: subprocess installed post-removal script returned error exit status 2
InstallationMedia: Ubuntu 9.10 "Karmic Koala" - Release amd64 (20091027)
Lsusb:
 Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
 Bus 002 Device 003: ID 05fe:0011 Chic Technology Corp. Browser Mouse
 Bus 002 Device 002: ID 413c:2105 Dell Computer Corp. Model L100 Keyboard
 Bus 002 Device 004: ID 051d:0002 American Power Conversion Uninterruptible Power Supply
 Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Package: nvidia-glx-185 (not installed)
ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.31-23-generic root=UUID=650cca26-c033-4eda-befc-32c31f095372 ro single
ProcVersionSignature: Ubuntu 2.6.31-23.75-generic
RelatedPackageVersions:
 xserver-xorg 1:7.4+3ubuntu10
 libgl1-mesa-glx 7.6.0-1ubuntu4.1
 libdrm2 2.4.14-1ubuntu1
 xserver-xorg-video-intel 2:2.9.0-1ubuntu2.2
 xserver-xorg-video-ati N/A
SourcePackage: nvidia-graphics-drivers-180
Title: package nvidia-glx-185 (not installed) failed to install/upgrade: subprocess installed post-removal script returned error exit status 2
Uname: Linux 2.6.31-23-generic x86_64
XorgConf: Error: [Errno 2] No such file or directory: '/etc/X11/xorg.conf'
dmi.bios.date: 03/22/2007
dmi.bios.vendor: Award Software International, Inc.
dmi.bios.version: FA
dmi.board.name: M57SLI-S4
dmi.board.vendor: Gigabyte Technology Co., Ltd.
dmi.board.version: x.x
dmi.chassis.type: 3
dmi.modalias: dmi:bvnAwardSoftwareInternational,Inc.:bvrFA:bd03/22/2007:svn:pn:pvr:rvnGigabyteTechnologyCo.,Ltd.:rnM57SLI-S4:rvrx.x:cvn:ct3:cvr:
fglrx: Not loaded
glxinfo: Error: command ['glxinfo'] failed with exit code 127: glxinfo: error while loading shared libraries: libGLcore.so.1: cannot open shared object file: No such file or directory
system:
 distro: Ubuntu
 architecture: x86_64kernel: 2.6.31-23-generic