Solving Ubuntu upgrade - Error ‘dpkg: error processing (--unpack)'

Find the offending package and perform

sudo dpkg -i --force-overwrite <filename.deb>

In my case:

sudo dpkg -i --force-overwrite /var/cache/apt/archives/libatk-adaptor-schemas_2.4.0-1ubuntu2_i386.deb
Then

sudo apt-get -f install

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