Ubuntu 14.04 Ros Indigo unmet dependencies

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Hi everyone, I decided to upgrade both OS and Ros distro.

I followed the usual preliminary instructions for the installation, but when I try to install the full version with

sudo apt-get install ros-indigo-desktop-full

I get this error:

Reading package lists... Done
Building dependency tree       
Reading state information... Done
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:
 ros-indigo-desktop-full : Depends: ros-indigo-perception but it is not going to be installed
E: Unable to correct problems, you have held broken packages.

I have been using Ros since Diamondback and I do not remember having this issue. I browsed the web looking for possible solutions, but I found none.

Does anyone of you have a way to solve it? Thanks in advance,

tambo