How to enable wifi in G50-70 on Ubuntu 14.04

Hi,
I dont see any key to enable wifi in my laptop.
Please help me to enable it.
I am using Ubuntu 14.04.2 LTS - 64 bit.
# lspci -vvnn | grep -A 9 Network
02:00.0 Network controller [0280]: Realtek Semiconductor Co., Ltd. RTL8723BE PCIe Wireless Network Adapter [10ec:b723]
   Subsystem: Lenovo Device [17aa:b736]
   Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
   Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
   Latency: 0, Cache Line Size: 64 bytes
   Interrupt: pin A routed to IRQ 10
   Region 0: I/O ports at 3000 [size=256]
   Region 2: Memory at c0400000 (64-bit, non-prefetchable) [size=16K]
   Capabilities: [40] Power Management version 3
       Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=375mA PME(D0+,D1+,D2+,D3hot+,D3cold+)
Can anyone have idea how to enable it and it will work smootly.

Hit the F7 key (the one with a white aircraft on it...). This is a kind of turn on/off button for the wireless inteface.

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How to enable wifi in G50-70 on Ubuntu 14.04

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