install a ubuntu, in the virtual machine and want to install a unity-tweak-tool, and then keep reporting errors:

You might want to run "apt-get -f install" to correct these:
The following packages have unmet dependencies:
 adwaita-icon-theme : Depends: libgtk-3-bin but it is not going to be installed
 aspell : Depends: dictionaries-common (> 0.40) but it is not going to be installed
 aspell-en : Depends: dictionaries-common (>= 0.49.2) but it is not going to be installed
 hunspell-en-us : Depends: dictionaries-common (>= 0.10) but it is not going to be installed
E: Unmet dependencies. Try "apt-get -f install" with no packages (or specify a solution).

then I went on to run sudo apt-get-f install

Preparing to unpack .../libgtk-3-bin_3.18.9-1ubuntu3.3_amd64.deb ...
Leaving "diversion of /usr/sbin/update-icon-caches to /usr/sbin/update-icon-caches.gtk2 by libgtk-3-bin"
Adding "diversion of /usr/share/man/man8/update-icon-caches.8.gz to /usr/share/man/man8/update-icon-caches.gtk2.8.gz by libgtk-3-bin"
dpkg-divert: error: rename involves overwriting "/usr/share/man/man8/update-icon-caches.gtk2.8.gz" with
  different file "/usr/share/man/man8/update-icon-caches.8.gz", not allowed
dpkg: error processing archive /var/cache/apt/archives/libgtk-3-bin_3.18.9-1ubuntu3.3_amd64.deb (--unpack):
 subprocess new pre-installation script returned error exit status 2
Preparing to unpack .../dictionaries-common_1.26.3_all.deb ...
Adding "diversion of /usr/share/dict/words to /usr/share/dict/words.pre-dictionaries-common by dictionaries-common"
dpkg-divert: error: rename involves overwriting "/usr/share/dict/words.pre-dictionaries-common" with
  different file "/usr/share/dict/words", not allowed
dpkg: error processing archive /var/cache/apt/archives/dictionaries-common_1.26.3_all.deb (--unpack):
 subprocess new pre-installation script returned error exit status 2
Errors were encountered while processing:
 /var/cache/apt/archives/libgtk-3-bin_3.18.9-1ubuntu3.3_amd64.deb
 /var/cache/apt/archives/dictionaries-common_1.26.3_all.deb
E: Sub-process /usr/bin/dpkg returned an error code (1)

the target platform is ubuntu16.04
. I don"t quite understand the error message. Is it because of gtk2 and gtk3? I don"t know how to solve ~ ask for advice