I have a different issue. The PVP client loads and updates correctly. The client logon validation fails. I know on windows the PVP client rolls through several steps before even validating the client login. Not sure what all is happening and happy to help were i can be of assistance.
Also the PVP client does not have sound at the animated login screen.
Running Linux Mint 16 (mate) 64bit // POL v.4.2.1 // LoL PVP Client 31413_11_19_11_32