UK Freesat boxes won't work in Libya due to the encryption. But there are plenty of unencrypted decoders available here which you can use, and most of the Freesat channels are available on the Nilesat bird. It's not exactly Freesat, but it's still free...
Sky (using a UK Skybox), yep, but Libya is right on the edge of the footprint of the Astra (Sky) bird, so you'll need a big static (you don't need tracking) dish. Minimum 2.4m diameter.