difficulty in Ubuntu 14.04 apt-getting R 3.3.2

Hi:

I have a Dockerfile, which builds an image which installed R 3.3.2 in
Ubuntu 14.04, but building using that Dockerfile seems to have stopped
working and I am unclear why.

I believe the relevant error is:

Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
 r-recommended : Depends: r-cran-cluster (>= 1.9.6-2) but it is not going
to be installed
                 Depends: r-cran-rpart (>= 3.1.20) but it is not going to
be installed
                 Depends: r-cran-survival (>= 2.13.2-1) but it is not going
to be installed

Any help in resolving this would be appreciated.

Additional information: while I need R 3.3.2 for historical purposes, when
I substitute 3.3.2 with 3.3.3 in the Dockerfile, the image builds
successfully.

Thanks!

Jen

Dockerfile:

FROM ubuntu:14.04

RUN apt-get update && \
   DEBIAN_FRONTEND="noninteractive" apt-get install -y
--no-install-recommends software-properties-common && \
    apt-add-repository "deb http://cran.r-project.org/bin/linux/ubuntu
trusty/" && \
    apt-get update && \
    DEBIAN_FRONTEND="noninteractive" apt-get install -y --force-yes
--no-install-recommends libcurl3-gnutls libcurl4-gnutls-dev libssl-dev
libssh2-1-dev r-base=3.3.2-1trusty0 r-base-dev=3.3.2-1trusty0
r-recommended=3.3.2-1trusty0 r-base-core=3.3.2-1trusty0

RUN locale-gen en_US.UTF-8
ENV LANG en_US.UTF-8
ENV LANGUAGE en_US:en
ENV LC_ALL en_US.UTF-8

WORKDIR /plugin/

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