Unpacking libdrm-nouveau1a (from .../libdrm-nouveau1a_2.4.23-1ubuntu3_amd64.deb) ...
dpkg: regarding .../xserver-xorg-core_2%3a1.9.99.901+git20110131.be3be758-0ubuntu1_amd64.deb containing xserver-xorg-core:
 xserver-xorg-core breaks xserver-xorg-video-8
  xserver-xorg-video-tseng provides xserver-xorg-video-8 and is present and installed.
  xserver-xorg-video-siliconmotion provides xserver-xorg-video-8 and is present and installed.
  xserver-xorg-video-ati provides xserver-xorg-video-8 and is present and installed.
  xserver-xorg-video-nv provides xserver-xorg-video-8 and is present and installed.
  xserver-xorg-video-mach64 provides xserver-xorg-video-8 and is present and installed.
  xserver-xorg-video-intel provides xserver-xorg-video-8 and is present and installed.
  xserver-xorg-video-chips provides xserver-xorg-video-8 and is present and installed.
  xserver-xorg-video-trident provides xserver-xorg-video-8 and is present and installed.
  xserver-xorg-video-s3 provides xserver-xorg-video-8 and is present and installed.
  xserver-xorg-video-i128 provides xserver-xorg-video-8 aAptOrdering:
xserver-xorg-video-nouveau: Install
plymouth-label: Install
plymouth-x11: Install
plymouth: Install
libgl1-mesa-dri: Install
libdrm-nouveau1: Remove
libdrm-nouveau1a: Install
xserver-xorg-core: Install
xserver-xorg-video-tseng: Install
xserver-xorg-core: Configure
xserver-xorg-video-tseng: Configure
xserver-xorg-video-ati: Remove
xserver-xorg-video-nv: Install
xserver-xorg-video-intel: Install
xserver-xorg-video-chips: Install
xserver-xorg-video-trident: Install
xserver-xorg-video-s3: Install
xserver-xorg-video-i128: Install
xserver-xorg-video-mga: Install
xserver-xorg-video-neomagic: Install
xserver-xorg-video-cirrus: Install
xserver-xorg-video-ark: Install
xserver-xorg-video-tdfx: Install
xserver-xorg-video-sisusb: Install
xserver-xorg-video-rendition: Install
xserver-xorg-video-vesa: Install
xserver-xorg-video-fbdev: Install
xserver-xorg-video-savage: Install
xserver-xorg-video-radeon: Install
xserver-xorg-video-vmware: Install
xserver-xorg-video-openchrome: Install
xserver-xorg-video-s3virge: Install
xserver-xorg-video-voodoo: Install
xserver-xorg-video-apm: Install
xserver-xorg-video-sis: Install
xserver-xorg-video-v4l: Remove
xserver-xorg-video-r128: Remove
xserver-xorg-video-mach64: Remove
xserver-xorg-video-siliconmotion: Install
xserver-xorg-video-siliconmotion: Configure
xserver-xorg: Install
xserver-xorg-video-all: Remove
xserver-xorg-input-synaptics: Install
xserver-xorg-input-evdev: Install
xserver-xorg-input-wacom: Install
xserver-xorg-input-all: Remove
xserver-xorg-input-vmmouse: Remove
xserver-xorg-input-mouse: Remove
libplymouth2: Install
nautilus-sendto-empathy: Install
empathy: Install
empathy-common: Install
libatk1.0-0: Install
libatk1.0-data: Install
gcalctool: Install
gir1.2-atk-1.0: Install
libgmime-2.4-2: Install
libgmime2.4-cil: Install
libvlccore4: Install
vlc-data: Install
libvlc5: Install
software-center: Install
unity-place-applications: Install
unity-place-files: Install
vlc-plugin-notify: Install
vlc-plugin-pulse: Install
vlc: Install
vlc-nox: Install
libdrm-nouveau1a: Configure
xserver-xorg-video-nouveau: Configure
libplymouth2: Configure
plymouth: Configure
plymouth-label: Configure
plymouth-x11: Configure
libgl1-mesa-dri: Configure
xserver-xorg-video-nv: Configure
xserver-xorg-video-intel: Configure
xserver-xorg-video-chips: Configure
xserver-xorg-video-trident: Configure
xserver-xorg-video-s3: Configure
xserver-xorg-video-i128: Configure
xserver-xorg-video-mga: Configure
xserver-xorg-video-neomagic: Configure
xserver-xorg-video-cirrus: Configure
xserver-xorg-video-ark: Configure
xserver-xorg-video-tdfx: Configure
xserver-xorg-video-sisusb: Configure
xserver-xorg-video-rendition: Configure
xserver-xorg-video-vesa: Configure
xserver-xorg-video-fbdev: Configure
xserver-xorg-video-savage: Configure
xserver-xorg-video-radeon: Configure
xserver-xorg-video-vmware: Configure
xserver-xorg-video-openchrome: Configure
xserver-xorg-video-s3virge: Configure
xserver-xorg-video-voodoo: Configure
xserver-xorg-video-apm: Configure
xserver-xorg-video-sis: Configure
xserver-xorg-input-wacom: Configure
xserver-xorg-input-synaptics: Configure
xserver-xorg-input-evdev: Configure
xserver-xorg: Configure
empathy-common: Configure
nautilus-sendto-empathy: Configure
empathy: Configure
libatk1.0-data: Configure
libatk1.0-0: Configure
gcalctool: Configure
gir1.2-atk-1.0: Configure
libgmime-2.4-2: Configure
libgmime2.4-cil: Configure
vlc-data: Configure
libvlccore4: Configure
libvlc5: Configure
software-center: Configure
unity-place-applications: Configure
unity-place-files: Configure
vlc-nox: Configure
vlc-plugin-notify: Configure
vlc-plugin-pulse: Configure
vlc: Configure