To trivially reproduce the problem:
sudo dpkg -i /var/cache/apt/archives/base-files_6.3ubuntu4_i386.deb (or amd64) sudo dpkg-reconfigure udev
To trivially reproduce the problem:
sudo dpkg -i /var/cache/ apt/archives/ base-files_ 6.3ubuntu4_ i386.deb (or amd64)
sudo dpkg-reconfigure udev