package libgl1-mesa-dri (not installed) failed to install/upgrade: trying to overwrite shared '/etc/drirc', which is different from other instances of package libgl1-mesa-dri:amd64

[Galen Thurber]

Xorg not allowing nvidia drivers to install,
nouveau won't surrender.
Upon reboot Xorg fails to find any screens due to nvidia not loading.

ProblemType: Package
DistroRelease: Ubuntu 14.04
Package: libgl1-mesa-dri (not installed)
Uname: Linux 4.1.0-040100rc6-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.11
Architecture: amd64
CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
CompositorRunning: None
Date: Sun Jul 12 09:21:29 2015
DistUpgraded: Fresh install
DistroCodename: trusty
DistroVariant: ubuntu
DkmsStatus:
 fwts-efi-runtime-dkms, 14.03.01, 3.19.0-21-generic, x86_64: installed
 fwts-efi-runtime-dkms, 14.03.01, 3.19.0-22-generic, x86_64: installed
 fwts-efi-runtime-dkms, 14.03.01, 3.19.0-23-generic, x86_64: installed
 virtualbox, 4.3.10: added
DpkgTerminalLog:
 Preparing to unpack .../libdrm-nouveau2_2.4.60-2~ubuntu14.04.1_amd64.deb ...
 Unpacking libdrm-nouveau2:amd64 (2.4.60-2~ubuntu14.04.1) ...
 Selecting previously unselected package libgl1-mesa-dri:amd64.
 Preparing to unpack .../libgl1-mesa-dri_10.1.3-0ubuntu0.4_amd64.deb ...
 Unpacking libgl1-mesa-dri:amd64 (10.1.3-0ubuntu0.4) ...
DuplicateSignature: package:libgl1-mesa-dri:(not installed):trying to overwrite shared '/etc/drirc', which is different from other instances of package libgl1-mesa-dri:amd64
ErrorMessage: trying to overwrite shared '/etc/drirc', which is different from other instances of package libgl1-mesa-dri:amd64
ExtraDebuggingInterest: Yes
GraphicsCard:
 NVIDIA Corporation G71 [GeForce 7900 GT/GTO] [10de:0291] (rev a1) (prog-if 00 [VGA controller])
   Subsystem: NVIDIA Corporation Device [10de:c560]
InstallationDate: Installed on 2015-05-10 (63 days ago)
InstallationMedia: Xubuntu 14.04.2 LTS "Trusty Tahr" - Release amd64 (20150218.1)
LightdmGreeterLog:
 ** (lightdm-gtk-greeter:1238): WARNING **: Failed to load user image: Failed to open file '/home/west/.face': Permission denied
 init: indicator-power main process (1274) killed by TERM signal
 init: indicator-application main process (1280) killed by TERM signal
LightdmGreeterLogOld:
 ** (lightdm-gtk-greeter:1246): WARNING **: Failed to load user image: Failed to open file '/home/west/.face': Permission denied
 init: indicator-power main process (1282) killed by TERM signal
 init: indicator-application main process (1289) terminated with status 1
MachineType: Gigabyte Technology Co., Ltd. GA-78LMT-USB3 6.0
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.1.0-040100rc6-generic root=UUID=b2e6ef75-e76d-436c-a4b0-2a40e37828a6 ro verbose=1 drm.debug=0xe
Renderer: Software
SourcePackage: mesa
Title: package libgl1-mesa-dri (not installed) failed to install/upgrade: trying to overwrite shared '/etc/drirc', which is different from other instances of package libgl1-mesa-dri:amd64
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 11/25/2014
dmi.bios.vendor: Award Software International, Inc.
dmi.bios.version: F2
dmi.board.name: GA-78LMT-USB3 6.0
dmi.board.vendor: Gigabyte Technology Co., Ltd.
dmi.board.version: SEx
dmi.chassis.type: 3
dmi.chassis.vendor: Gigabyte Technology Co., Ltd.
dmi.modalias: dmi:bvnAwardSoftwareInternational,Inc.:bvrF2:bd11/25/2014:svnGigabyteTechnologyCo.,Ltd.:pnGA-78LMT-USB36.0:pvr:rvnGigabyteTechnologyCo.,Ltd.:rnGA-78LMT-USB36.0:rvrSEx:cvnGigabyteTechnologyCo.,Ltd.:ct3:cvr:
dmi.product.name: GA-78LMT-USB3 6.0
dmi.sys.vendor: Gigabyte Technology Co., Ltd.
version.compiz: compiz N/A
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.60-2~ubuntu14.04.1
version.libgl1-mesa-dri: libgl1-mesa-dri N/A
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 10.1.3-0ubuntu0.4
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 N/A
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: Sun Jul 12 09:22:32 2015
xserver.configfile: default
xserver.devices:
 input Power Button KEYBOARD, id 6
 input Power Button KEYBOARD, id 7
 input Microsoft Basic Optical Mouse MOUSE, id 8
 input AT Translated Set 2 keyboard KEYBOARD, id 9
xserver.logfile: /var/log/Xorg.0.log
xserver.version: 2:1.15.1-0ubuntu2.7
xserver.video_driver: nouveau

[Galen Thurber (godfree2)]

has nv304 support been depricated in xorg 1.15.1 ?
because xorg 1.12 on another distro will work in this machine