Hi Folks. I'v been struggling with the wifi adapter problem for my legion Y540 on the ubuntu 18.04 system. I have tried a lot solutions but none is working.The output of lshw -C Network

```

*-network UNCLAIMED
description: Network controller
product: Intel Corporation
vendor: Intel Corporation
physical id: 14.3
bus info: pci@0000:00:14.3
version: 00
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress msix cap_list
configuration: latency=0
resources: memory:c2498000-c249bfff
*-network
description: Ethernet interface
product: RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller
vendor: Realtek Semiconductor Co., Ltd.
physical id: 0
bus info: pci@0000:07:00.0
logical name: enp7s0
version: 15
serial: 54:05:db:f8:4f:15
size: 1Gbit/s
capacity: 1Gbit/s
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress msix bus_master cap_list ethernet physical tp mii 10bt 10bt-fd 100bt 100bt-fd 1000bt-fd autonegotiation
configuration: autonegotiation=on broadcast=yes driver=r8169 duplex=full firmware=rtl8168h-2_0.0.2 02/26/15 ip=10.128.96.12 latency=0 link=yes multicast=yes port=MII speed=1Gbit/s
resources: irq:18 ioport:3000(size=256) memory:c2204000-c2204fff memory:c2200000-c2203fff```

Does anyone know how to solve the problem? Please help me about this. Thank you in advance!