First, you should make sure that you are running on the latest OS.

Add these repos in the App Manager

Catalog name: Nokia catalog
Web address: http://catalogue.tableteer.nokia.com/certified/
Distribution: (Empty)
Components: user

Catalog name: Nokia catalog (3rd party software)
Web address: http://catalogue.tableteer.nokia.com/non-certified/
Distribution: (Empty)
Components: user

Catalog name: maemo Extras
Web address: http://repository.maemo.org/extras
Distribution: (Empty)
Components: free non-free

Catalog name: maemo Extras For Diablo
Web address: http://repository.maemo.org/extras
Distribution: chinook diablo
Components: free non-free

Catalog name: maemo Chinook For Diablo
Web address: http://repository.maemo.org
Distribution: chinook diablo
Components: free non-free

Install USB Host so you can see your USB Drive