dpkg-deb: error: paste subprocess was killed by signal (Broken pipe)
Press Ctrl+Alt+T and do:
sudo dpkg -i --force-overwrite /var/cache/apt/archives/nvidia-340_340.107-0ubuntu0~gpu18.04.1_amd64.deb
This will resolve "the trying to overwrite error" with the mighty force of dpkg. :)
Then run:
sudo apt -f install
to fix if any broken packages.