how to use navigation and stage together

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Hi,

My program use navigation and stage both stack. but when i try to install navigation stack i got the following Message to uninstall my stage

sudo apt-get install ros-electric-navigation
Reading package lists... Done
Building dependency tree       
Reading state information... Done
The following packages were automatically installed and are no longer required:
  linux-headers-3.2.0-43 linux-headers-3.2.0-43-generic linux-headers-3.5.0-23
  libjpeg62 linux-headers-3.5.0-23-generic
Use 'apt-get autoremove' to remove them.
The following extra packages will be installed:
  libhdf5-serial-dev libjpeg-dev libjpeg-turbo8-dev libjpeg8-dev
  libsdl-image1.2-dev libtiff4-dev libvtk5-dev ros-electric-perception-pcl
Suggested packages:
  libhdf5-doc vtk-examples vtk-doc
The following packages will be REMOVED:
  libjpeg62-dev ros-electric-stage
The following NEW packages will be installed:
  libhdf5-serial-dev libjpeg-dev libjpeg-turbo8-dev libjpeg8-dev
  libsdl-image1.2-dev libtiff4-dev libvtk5-dev ros-electric-navigation
  ros-electric-perception-pcl
0 upgraded, 9 newly installed, 2 to remove and 10 not upgraded.
Need to get 0 B/117 MB of archives.
After this operation, 445 MB of additional disk space will be used.
Do you want to continue [Y/n]? n
Abort.