package fglrx was purged but generated "failed to install" errors after reboot

[Rachel "Penth" Rawlings]

In order to get new Radeon HD 7770 card working, I followed the recipe at http://nerdysermons.blogspot.com/2011/11/solve-graphic-driver-errors-unity-3d.html.

ProblemType: Package
DistroRelease: Ubuntu 12.04
Package: fglrx (not installed)
ProcVersionSignature: Ubuntu 3.2.0-24.39-generic 3.2.16
Uname: Linux 3.2.0-24-generic x86_64
.tmp.unity.support.test.1:

ApportVersion: 2.0.1-0ubuntu8
AptOrdering:
 fglrx: Purge
 fglrx-amdcccle-updates: Purge
 fglrx-updates-dev: Purge
 fglrx-updates: Purge
 xorg-driver-fglrx: Purge
Architecture: amd64
CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
CompositorRunning: None
Date: Wed May 30 22:07:59 2012
DistUpgraded: 2012-04-27 12:12:45,343 DEBUG enabling apt cron job
DistroCodename: precise
DistroVariant: ubuntu
DkmsStatus:
 lg4l, 0.12, 3.0.0-19-generic, x86_64: installed
 lg4l, 0.12, 3.2.0-24-generic, x86_64: installed
ErrorMessage: subprocess installed post-removal script returned error exit status 1
GraphicsCard:
 Advanced Micro Devices [AMD] nee ATI Device [1002:683d] (prog-if 00 [VGA controller])
   Subsystem: Giga-byte Technology Device [1458:2556]
MachineType: Gigabyte Technology Co., Ltd. GA-MA790GP-UD4H
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.2.0-24-generic root=UUID=4712b150-920c-40a3-add7-d7cd4ea0ea2f ro quiet splash vt.handoff=7
SourcePackage: fglrx-installer
Title: package fglrx (not installed) failed to install/upgrade: subprocess installed post-removal script returned error exit status 1
UpgradeStatus: Upgraded to precise on 2012-04-27 (33 days ago)
dmi.bios.date: 09/17/2009
dmi.bios.vendor: Award Software International, Inc.
dmi.bios.version: F6
dmi.board.name: GA-MA790GP-UD4H
dmi.board.vendor: Gigabyte Technology Co., Ltd.
dmi.board.version: x.x
dmi.chassis.type: 3
dmi.chassis.vendor: Gigabyte Technology Co., Ltd.
dmi.modalias: dmi:bvnAwardSoftwareInternational,Inc.:bvrF6:bd09/17/2009:svnGigabyteTechnologyCo.,Ltd.:pnGA-MA790GP-UD4H:pvr:rvnGigabyteTechnologyCo.,Ltd.:rnGA-MA790GP-UD4H:rvrx.x:cvnGigabyteTechnologyCo.,Ltd.:ct3:cvr:
dmi.product.name: GA-MA790GP-UD4H
dmi.sys.vendor: Gigabyte Technology Co., Ltd.
version.compiz: compiz 1:0.9.7.8-0ubuntu1
version.ia32-libs: ia32-libs 20090808ubuntu36
version.libdrm2: libdrm2 2.4.32-1ubuntu1
version.libgl1-mesa-dri: libgl1-mesa-dri 8.0.2-0ubuntu3.1
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 8.0.2-0ubuntu3.1
version.xserver-xorg-core: xserver-xorg-core 2:1.11.4-0ubuntu10.2
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.7.0-0ubuntu1.1
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:6.14.99~git20111219.aacbd629-0ubuntu2
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.17.0-1ubuntu4
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:0.0.16+git20111201+b5534a1-1build2