I have also a Problem with Ubuntu (an older version).
No error logs.
I start Minecraft with the lastest Forge Loader, and a little Window with FML appears.
This window freezes (Thats what I think because it simply don't work) and it stays on 0%.
I let the Computer run for 1 hour and nothing happened.
And yes i deleted the META-INF
I think we can maybe have the same problem but he can't see the FML window.