Cannot install any version of ros

edit

When I follow the install instructions it says that nothing can be installed be cause dependencies will not be installed. How do I fix this? Using ubuntu 12.04

here is the error I get

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-groovy-desktop-full : Depends: ros-groovy-ros-tutorials (= 0.3.9-0precise-20121230-1218-+0000) but it is not going to be installed
                           Depends: ros-groovy-nodelet-core (= 1.7.13-0precise-20130104-0044-+0000) but it is not going to be installed
                           Depends: ros-groovy-navigation-tutorials (= 0.1.1-s1357276030~precise) but it is not going to be installed
                           Depends: ros-groovy-geometry-tutorials (= 0.1.3-s1357177371~precise) but it is not going to be installed
                           Depends: ros-groovy-filters (= 1.6.0-s1356885392~precise) but it is not going to be installed
                           Depends: ros-groovy-slam-gmapping (= 1.2.7-s1357273397~precise) but it is not going to be installed
                           Depends: ros-groovy-qt-gui-core (= 0.2.9-0precise-20121230-1132-+0000) but it is not going to be installed
                           Depends: ros-groovy-vision-opencv (= 1.10.0-0precise-20130103-2233-+0000) but it is not going to be installed
                           Depends: ros-groovy-perception-pcl (= 1.0.25-0precise-20130104-0111-+0000) but it is not going to be installed
                           Depends: ros-groovy-rqt-common-plugins (= 0.2.7-0precise-20130104-0046-+0000) but it is not going to be installed
                           Depends: ros-groovy-actionlib (= 1.9.11-0precise-20130102-2201-+0000) but it is not going to be installed
                           Depends: ros-groovy-image-pipeline (= 1.10.1-0precise-20130104-0139-+0000) but it is not going to be installed
                           Depends: ros-groovy-stage (= 1.6.7-s1357177365~precise) but it is not going to be installed
                           Depends: ros-groovy-rqt-robot-plugins (= 0.2.7-0precise-20130103-2333-+0000) but it is not going to be installed
                           Depends: ros-groovy-image-common (= 1.9.22-0precise-20130103-0000-+0000) but it is not going to be installed
                           Depends: ros-groovy-bond-core (= 1.7.9-0precise-20121230-1144-+0000) but it is not going to be installed
                           Depends: ros-groovy-common-tutorials (= 0.2.3-s1357260899~precise) but it is not going to be installed
                           Depends: ros-groovy-ros-comm (= 1.9.39-0precise-20121230-1434-+0000) but it is not going to be installed
                           Depends: ros-groovy-driver-common (= 1.6.4-0precise-20130104-0045-+0000) but it is not going to be installed
                           Depends: ros-groovy-executive-smach (= 1.2.0-s1357171161~precise) but it is not going to be installed
                           Depends: ros-groovy-dynamic-reconfigure (= 1.5.31-0precise-20130104-0028-+0000) but it is not going to be installed
                           Depends: ros-groovy-image-transport-plugins (= 1.8.15-0precise-20130104-0046-+0000) but it is not going to be installed
                           Depends: ros-groovy-xacro (= 1.6.1-s1356886240~precise) but it is not going to be installed
                           Depends: ros-groovy-robot-model (= 1.9.32-0precise-20130103-0145-+0000) but it is not going to be installed
                           Depends: ros-groovy-visualization-tutorials (= 0.7.3-s1357254450~precise) but it is not going to be installed
                           Depends: ros-groovy-geometry (= 1.9.28-0precise-20130103-0114-+0000) but it is not going to be installed
                           Depends: ros-groovy-documentation (= 1.5.3-s1356885143~precise) but it is not going to be installed
                           Depends: ros-groovy-laser-pipeline (= 1.5.5-s1357268665~precise) but it is not going to be installed
                           Depends: ros-groovy-simulator-gazebo (= 1.7.6-s1357263540~precise) but it is not going ...