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While updating it told to try running apt-get -f install. On doing this i'm facing the following error:

Reading package lists... Done
Building dependency tree       
Reading state information... Done
Correcting dependencies... Done
The following extra packages will be installed:
  gconf-service gconf2-common libgconf-2-4
The following packages will be REMOVED:
The following packages will be upgraded:
  gconf-service gconf2-common libgconf-2-4
3 upgraded, 0 newly installed, 1 to remove and 961 not upgraded.
2 not fully installed or removed.
Need to get 0 B/1,846 kB of archives.
After this operation, 6,053 kB of additional disk space will be used.
Do you want to continue [Y/n]? y
WARNING: The following packages cannot be authenticated!
  gconf-service libgconf-2-4 gconf2-common
Install these packages without verification [y/N]? y
(Reading database ... 143783 files and directories currently installed.)
Preparing to replace gconf-service 3.2.5-0ubuntu2 (using .../gconf-service_3.2.5-1+build1_i386.deb) ...
Unpacking replacement gconf-service ...
dpkg: error processing /var/cache/apt/archives/gconf-service_3.2.5-1+build1_i386.deb (--unpack):
 trying to overwrite '/usr/lib/i386-linux-gnu/gconf/2/libgconfbackend-evoldap.so', which is also in package gconf-service-backend 3.2.5-0ubuntu2
dpkg-deb (subprocess): subprocess data was killed by signal (Broken pipe)
dpkg-deb: error: subprocess  returned error exit status 2
Errors were encountered while processing:
E: Sub-process /usr/bin/dpkg returned an error code (1)
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