$ sudo apt --fix-broken install
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Correcting dependencies... Done
The following additional packages will be installed:
  gconf-service gconf2-common
The following packages will be REMOVED:
  gconf-service-backend
The following packages will be upgraded:
  gconf-service gconf2-common
2 upgraded, 0 newly installed, 1 to remove and 609 not upgraded.
85 not fully installed or removed.
Need to get 0 B/1,455 kB of archives.
After this operation, 5,626 kB of additional disk space will be used.
Do you want to continue? [Y/n] y
(Reading database ... 221490 files and directories currently installed.)
Preparing to unpack .../gconf-service_3.2.6-4+b1_amd64.deb ...
Unpacking gconf-service (3.2.6-4+b1) over (3.2.6-3ubuntu7) ...
dpkg: error processing archive /var/cache/apt/archives/gconf-service_3.2.6-4+b1_amd64.deb (--unpack):
 trying to overwrite '/usr/lib/x86_64-linux-gnu/gconf/2/libgconfbackend-evoldap.so', which is also in package gconf-service-backend 3.2.6-3ubuntu7
dpkg-deb: error: subprocess paste was killed by signal (Broken pipe)
Errors were encountered while processing:
 /var/cache/apt/archives/gconf-service_3.2.6-4+b1_amd64.deb
E: Sub-process /usr/bin/dpkg returned an error code (1)