Public bug reported:

Using Ubuntu GNOME 14.04 LTS 64bit with the following PPAs included in the 
Software Sources:
1) gnome3
2) gnome3-staging
2) gnome3-next
I get the following error when executing 'sudo apt-get dist-upgrade':
========================
Preparing to unpack .../gnome-session_3.11.4-0ubuntu1~trusty1_all.deb ...
Unpacking gnome-session (3.11.4-0ubuntu1~trusty1) over (3.9.90-0ubuntu8) ...
dpkg: error processing archive 
/var/cache/apt/archives/gnome-session_3.11.4-0ubuntu1~trusty1_all.deb 
(--unpack):
 trying to overwrite '/usr/share/xsessions/ubuntu.desktop', which is also in 
package ubuntu-session 3.9.90-0ubuntu8
dpkg-deb: error: subprocess paste was killed by signal (Broken pipe)
Errors were encountered while processing:
 /var/cache/apt/archives/gnome-session_3.11.4-0ubuntu1~trusty1_all.deb
E: Sub-process /usr/bin/dpkg returned an error code (1)
========================

My installations is two days old.
I've never seen the '(Broken pipe)' reference before, so I assume this is a 
packaging issue.

I don't know what information to provide, so I kindly ask for your 
understanding and guidance if more information is needed.
Attached to the report are the outputs of:
1) cat /etc/apt/sources.list
2) ls /etc/apt/sources.list.d
3) uname -a

And here is the full output of 'sudo apt-get dist-upgrade':
============================
elias@ubuntu:~$ sudo apt-get dist-upgrade
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Calculating upgrade... Done
The following packages will be REMOVED:
  ubuntu-session
The following NEW packages will be installed:
  geoclue-2.0 gnustep-base-common gnustep-base-runtime gnustep-common
  libgnustep-base1.24 libobjc4 unar
The following packages will be upgraded:
  empathy empathy-common file-roller gnome-session gnome-session-bin
  gnome-session-common mcp-account-manager-goa
7 upgraded, 7 newly installed, 1 to remove and 0 not upgraded.
Need to get 0 B/10.9 MB of archives.
After this operation, 27.3 MB of additional disk space will be used.
Do you want to continue? [Y/n] y
WARNING: The following packages cannot be authenticated!
  gnome-session gnome-session-bin gnome-session-common mcp-account-manager-goa
  empathy empathy-common geoclue-2.0 file-roller
Install these packages without verification? [y/N] y
(Reading database ... 348408 files and directories currently installed.)
Preparing to unpack .../gnome-session_3.11.4-0ubuntu1~trusty1_all.deb ...
Unpacking gnome-session (3.11.4-0ubuntu1~trusty1) over (3.9.90-0ubuntu8) ...
dpkg: error processing archive 
/var/cache/apt/archives/gnome-session_3.11.4-0ubuntu1~trusty1_all.deb 
(--unpack):
 trying to overwrite '/usr/share/xsessions/ubuntu.desktop', which is also in 
package ubuntu-session 3.9.90-0ubuntu8
dpkg-deb: error: subprocess paste was killed by signal (Broken pipe)
Errors were encountered while processing:
 /var/cache/apt/archives/gnome-session_3.11.4-0ubuntu1~trusty1_all.deb
E: Sub-process /usr/bin/dpkg returned an error code (1)
=======================

Using 'apt-get install -f' and 'dpkg --configure -a' doesn't make any
differnce.

Thank you in advance.

** Affects: ubuntu-gnome
     Importance: Undecided
         Status: New


** Tags: gnome-session gnome3 trusty

** Package changed: ubuntu => ubuntu-gnome

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https://bugs.launchpad.net/bugs/1285488

Title:
  error processing archive /var/cache/apt/archives/gnome-
  session_3.11.4-0ubuntu1~trusty1_all.deb (--unpack)

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