Unable to correct problems, you have held broken packages.

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Hi

I am new to linux and ROS. I tried to install the ROS following http://wiki.ros.org/indigo/Installati... . At the step of sudo apt-get install ros-indigo-desktop-full, I get below messages. I cannot install ros-indigo-perception even if i go install all the depends of it. I tried to solve this by sudo apt-get install libsdformat1 , this did not help this situation.

My environment is followings; Distributor ID: Ubuntu Description: Ubuntu 14.04.4 LTS Release: 14.04 Codename: trusty

Thank you so much for your help in advance.

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.