the extras repository in the application manager is NOT 'Disabled'. and i suppose that Hildon Application Manager (HAM) is same as Application Manager that we go from the main menu.

also i have disabled the extras repository from the application manager, restarted the phone and enabled the repository and tried to update, but even that didnt work.

but my problem with using the gps was solved when i used the option 'allow network positioning' from the settings.