Sometimes an application won’t install because there are unresolved dependencies on other files. Make a note of the missing file names, then go to this site:
On the right-hand side is a Search function. Find a repository that contains the missing file and add the repository to your Application Manager by clicking on the green “Click to install!” icon. After you have added any repositories that you needed, you should then be able to complete the install of your application.
 Which applications use the camera in the N810 or N800?