I've tried a few times to download the above progams from the app manager, but when i click "details" it has "not installable" under the problems section?

When I click on facebook when was already added out of the box, it comes up after a while that package was lost or something along those lines.

Is this a problem relating to my other problem on the other thread "can't get my repositories to work"?

Or something different?

P.s also tried the amazon widget and the APnews one and comes up after a while of downloading "Application package not found"!

Same issue here. It was resolved by making all the repositories in app manager. Someone mentioned this in another thread. I guess KMPlayer was not able to install a dependency with only the Extras-Testing active.