package fglrx (not installed) failed to install/upgrade: el subproceso instalado el script post-installation devolvió el código de salida de error 2

[Alvaro Urbaez]

After install some updates, once my PC was restarted, I was not able to log in to graphic interface, getting the following errors on .xsession-errors:

X Error of failed request: BadRequest (invalid request code or no such operation)
  Major opcode of failed request: 157 (ATIFGLEXTENSION)
  Minor opcode of failed request: 66 ()
  Serial number of failed request: 23
  Current serial number in output stream: 23
Script para xim iniciada en run_im.
init: at-spi2-registryd main proceso terminado, reiniciando
init: at-spi2-registryd main proceso terminado, reiniciando
init: at-spi2-registryd main proceso terminado, reiniciando
init: at-spi2-registryd main proceso terminado, reiniciando
init: gnome-session (Unity) main proceso (5430) terminó con estatus 1
init: unity-settings-daemon main proceso (5416) interumpido por la señal TERM
init: logrotate main proceso (5356) interumpido por la señal TERM
init: update-notifier-crash (/var/crash/_usr_bin_nm-applet.104.crash) main proceso (5391) interumpido por la señal TERM
init: xsession-init main proceso (5411) interumpido por la señal TERM
init: hud main proceso (5422) interumpido por la señal TERM
init: Disconnected from notified D-Bus bus
init: unity-panel-service main proceso (5435) interumpido por la señal TERM
init: window-stack-bridge main proceso (5379) interumpido por la señal KILL

==================
The only solution I could find was uninstall all packages related to FGLXR and install gdm over lightdm..
I will try to restore graphics drivers from repositories.. I have an CrossFireX with HD6770 and HD6750..
Regards...

ProblemType: Package
DistroRelease: Ubuntu 14.04
Package: fglrx (not installed)
ProcVersionSignature: Ubuntu 3.13.0-74.118-generic 3.13.11-ckt30
Uname: Linux 3.13.0-74-generic x86_64
.tmp.unity.support.test.0:

ApportVersion: 2.14.1-0ubuntu3.19
Architecture: amd64
BootLog:
 Skipping profile in /etc/apparmor.d/disable: usr.bin.firefox
 Skipping profile in /etc/apparmor.d/disable: usr.sbin.rsyslogd
  * Starting AppArmor profiles 
[ OK ]
CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
CompositorRunning: compiz
CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
CompositorUnredirectFSW: true
Date: Thu Dec 24 21:12:25 2015
DistUpgraded: 2015-02-21 20:45:12,730 DEBUG enabling apt cron job
DistroCodename: trusty
DistroVariant: ubuntu
DkmsStatus: virtualbox, 4.3.34, 3.13.0-74-generic, x86_64: installed
DuplicateSignature: package:fglrx:(not installed):el subproceso instalado el script post-installation devolvió el código de salida de error 2
ErrorMessage: el subproceso instalado el script post-installation devolvió el código de salida de error 2
GraphicsCard:
 Advanced Micro Devices, Inc. [AMD/ATI] Juniper XT [Radeon HD 6770] [1002:68ba] (prog-if 00 [VGA controller])
   Subsystem: PC Partner Limited / Sapphire Technology Device [174b:e144]
 Advanced Micro Devices, Inc. [AMD/ATI] Juniper PRO [Radeon HD 6750] [1002:68bf] (prog-if 00 [VGA controller])
   Subsystem: PC Partner Limited / Sapphire Technology Device [174b:e144]
InstallationDate: Installed on 2014-04-13 (621 days ago)
InstallationMedia: Ubuntu 12.04.1 LTS "Precise Pangolin" - Release amd64 (20120823.1)
MachineType: BIOSTAR Group TA990FXE
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-74-generic root=UUID=e10fa592-6108-4087-9b56-6327ddc84acf ro quiet splash vt.handoff=7
RelatedPackageVersions:
 dpkg 1.17.5ubuntu5.5
 apt 1.0.1ubuntu2.10
SourcePackage: fglrx-installer
Title: package fglrx (not installed) failed to install/upgrade: el subproceso instalado el script post-installation devolvió el código de salida de error 2
UpgradeStatus: Upgraded to trusty on 2015-02-22 (306 days ago)
dmi.bios.date: 09/07/2011
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 4.6.4
dmi.board.asset.tag: None
dmi.board.name: TA990FXE
dmi.board.vendor: BIOSTAR Group
dmi.chassis.asset.tag: None
dmi.chassis.type: 3
dmi.chassis.vendor: BIOSTAR Group
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr4.6.4:bd09/07/2011:svnBIOSTARGroup:pnTA990FXE:pvr:rvnBIOSTARGroup:rnTA990FXE:rvr:cvnBIOSTARGroup:ct3:cvr:
dmi.product.name: TA990FXE
dmi.sys.vendor: BIOSTAR Group
version.compiz: compiz 1:0.9.11.3+14.04.20150313-0ubuntu1
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.60-2~ubuntu14.04.1
version.libgl1-mesa-dri: libgl1-mesa-dri 10.1.3-0ubuntu0.5
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 10.1.3-0ubuntu0.5
version.xserver-xorg-core: xserver-xorg-core 2:1.15.1-0ubuntu2.7
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.8.2-1ubuntu2
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.3.0-1ubuntu3.1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.910-0ubuntu1.6
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.10-1ubuntu2
xserver.bootTime: Fri Dec 25 12:13:02 2015
xserver.configfile: /etc/X11/xorg.conf
xserver.devices:
 input Power Button KEYBOARD, id 6
 input Power Button KEYBOARD, id 7
 input USB Keyboard KEYBOARD, id 8
 input USB Keyboard KEYBOARD, id 9
 input Genius USB Optical Mouse MOUSE, id 10
xserver.errors: RADEON(G0): [XvMC] Failed to initialize extension.
xserver.logfile: /var/log/Xorg.0.log
xserver.version: 2:1.15.1-0ubuntu2.7
xserver.video_driver: radeon