#amd64 version
cd /tmp
sudo -c wget https://launchpad.net/ubuntu/+archive/primary/+files/dpkg_1.18.4ubuntu1.1_amd64.deb

sudo tar x dpkg*.deb data.tar.gz
sudo tar xfvz data.tar.gz ./usr/bin/dpkg
sudo cp ./usr/bin/dpkg /usr/bin/
sudo apt-get update
sudo apt-get install --reinstall dpkg