The following packages have unmet dependencies (?) [nav2d]

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Hello everyone, I'm trying to install nav2d but seems that something is not installed, here i paste my errors:

pi@raspberrypi:~ $ sudo apt-get install ros-indigo-nav2d 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-nav2d : Depends: ros-indigo-nav2d-karto but it is not going to be installed Depends: ros-indigo-nav2d-tutorials but it is not going to be installed E: Unable to correct problems, you have held broken packages.

I also noticed that "unmet" dependencies error also occour when i try to install rviz via

apt-get install ros-indigo-rviz.

Other base packages seems to work fine, i've already used rosnode rostopic etcc including rosserial.
I've installed ros over raspberry pi using an image found on another website containing raspbian. I also noticed a strage thing, when i look in repositories at: /etc/apt/sources.list.d/ros-latest.list the contenent of the file is:

deb http://packages.ros.org/ros/ubuntu trusty main

I don't understand why it is setted to "trusty" and not to "jessie" since sending a simple:"cat /etc/os-release" reports:

PRETTY_NAME="Raspbian GNU/Linux 8 (jessie)" NAME="Raspbian GNU/Linux" VERSION_ID="8" VERSION="8 (jessie)" ID=raspbian ID_LIKE=debian HOME_URL="http://www.raspbian.org/" SUPPORT_URL="http://www.raspbian.org/RaspbianForums" BUG_REPORT_URL="http://www.raspbian.org/RaspbianBugs"