There was a new requirement (don't remember which version) for R packages to have a namespace. so it could be that the package rcmdr in the repo is outdated (they usually are)
so instead of installing rcmdr from the repo via sudo apt-get can you remove the package first and reinstall it within R?
In the terminal type
and then at the R prompt
Then it will prompt you to choose a mirror to download the package.
Edited: If you start R without sudo the packages would be install in your home directory, which is fine if you are the only user.
To get an up to date version of R you can either compile it (which is easy) or from this ppa
I usually install and update my R packages from within R rather than from repositories(to update, start R in the terminal with "sudo R" and then at the R prompt type "update.packages()" (no quotations)
Also if you need a GUI or IDE for R maybe you should checkout R studio. I found rcmdr to be primitive and buggy. I would rather use the terminal if I have to use rcmdr