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Unpacking mutter-common (3.12.0-0ubuntu1~trusty1) over (3.10.4-0ubuntu2) ...
A seleccionar pacote anteriormente não seleccionado libmutter0d.
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Unpacking libmutter0d (3.12.0-0ubuntu1~trusty1) ...
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Unpacking gnome-accessibility-themes (3.12.0-0ubuntu1~trusty1) over (3.10.0-1ubuntu2) ...
Preparing to unpack .../gnome-themes-standard_3.12.0-0ubuntu1~trusty1_amd64.deb ...
Unpacking gnome-themes-standard:amd64 (3.12.0-0ubuntu1~trusty1) over (3.10.0-1ubuntu2) ...
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Unpacking gnome-themes-standard-data (3.12.0-0ubuntu1~trusty1) over (3.10.0-1ubuntu2) ...
Preparing to unpack .../libnautilus-extension1a_1%3a3.12.0-0ubuntu1~trusty1_amd64.deb ...
Unpacking libnautilus-extension1a (1:3.12.0-0ubuntu1~trusty1) over (1:3.10.1-0ubuntu8) ...
A seleccionar pacote anteriormente não seleccionado libtracker-sparql-1.0-0:amd64.
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Unpacking libtracker-sparql-1.0-0:amd64 (1.0.0-1ubuntu1~trusty1) ...
Preparing to unpack .../nautilus_1%3a3.12.0-0ubuntu1~trusty1_amd64.deb ...
Unpacking nautilus (1:3.12.0-0ubuntu1~trusty1) over (1:3.10.1-0ubuntu8) ...
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Preparing to unpack .../gir1.2-gdm-1.0_3.12.0-0ubuntu1~trusty1_amd64.deb ...
Unpacking gir1.2-gdm-1.0 (3.12.0-0ubuntu1~trusty1) over (3.10.0.1-0ubuntu3) ...
Preparing to unpack .../libjson-glib-1.0-common_1.0.0-1~trusty1_all.deb ...
Unpacking libjson-glib-1.0-common (1.0.0-1~trusty1) over (0.16.2-1ubuntu1) ...
Preparing to unpack .../libjson-glib-1.0-0_1.0.0-1~trusty1_amd64.deb ...
Unpacking libjson-glib-1.0-0:amd64 (1.0.0-1~trusty1) over (0.16.2-1ubuntu1) ...
Preparing to unpack .../gnome-icon-theme-symbolic_3.12.0-1~trusty1_all.deb ...
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Unpacking gnome-power-manager (3.8.2-1ubuntu3~trusty1) over (3.8.2-1ubuntu2) ...
Preparing to unpack .../gnome-session_3.11.4-0ubuntu1~trusty2_all.deb ...
Unpacking gnome-session (3.11.4-0ubuntu1~trusty2) over (3.9.90-0ubuntu12) ...
dpkg: error processing archive /var/cache/apt/archives/gnome-session_3.11.4-0ubuntu1~trusty2_all.deb (--unpack):
 a tentar sobre-escrever '/usr/share/upstart/sessions/gnome-session.conf', que também está no pacote gnome-session-bin 3.9.90-0ubuntu12