Problem updating R

• Explaining the issue

  Setting up r-base-core (3.3.2-1trusty0) ...
  Preserving user changes to /usr/share/bash-completion/completions/R (renamed from /etc/bash_completion.d/R)...
  mv: cannot stat ‘/usr/share/bash-completion/completions/R’: No such file or directory
  dpkg: error processing package r-base-core (--configure):
   subprocess installed post-installation script returned error exit status 1
  

  The post-installation script (/var/lib/dpkg/info/r-base-core.postinst) didn't check if /usr/share/bash-completion/completions/R file exist before trying to move it.
• Quick fix / Workaround
  1. Just create copy of the file.

     sudo cp /etc/bash_completion.d/R /usr/share/bash-completion/completions/R
     

  2. Fix the interrupted installation

     sudo apt-get -f install
     

• Definitive fix
  As bodhi.zazen said, raise a bug report to the project.