wifi not working

stepan@stepan-LX:~/Desktop$ iwconfig
enp2s0    no wireless extensions.

lo        no wireless extensions.

stepan@stepan-LX:~/Desktop$ uname -a
Linux stepan-LX 4.2.0-18-generic #22-Ubuntu SMP Fri Nov 6 18:25:50 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux


stepan@stepan-LX:~/Desktop$ route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
stepan@stepan-LX:~/Desktop$


stepan@stepan-LX:~/Desktop$ lspci -nnk
00:00.0 Host bridge [0600]: Intel Corporation Xeon E3-1200 v3/4th Gen Core Processor DRAM Controller [8086:0c04] (rev 06)
    Subsystem: Dell Device [1028:0685]
00:01.0 PCI bridge [0604]: Intel Corporation Xeon E3-1200 v3/4th Gen Core Processor PCI Express x16 Controller [8086:0c01] (rev 06)
    Kernel driver in use: pcieport
00:02.0 VGA compatible controller [0300]: Intel Corporation 4th Gen Core Processor Integrated Graphics Controller [8086:0416] (rev 06)
    DeviceName:  Onboard IGD
    Subsystem: Dell Device [1028:0685]
    Kernel driver in use: i915
00:03.0 Audio device [0403]: Intel Corporation Xeon E3-1200 v3/4th Gen Core Processor HD Audio Controller [8086:0c0c] (rev 06)
    Subsystem: Dell Device [1028:0685]
    Kernel driver in use: snd_hda_intel
00:04.0 Signal processing controller [1180]: Intel Corporation Device [8086:0c03] (rev 06)
    Subsystem: Dell Device [1028:0685]
00:14.0 USB controller [0c03]: Intel Corporation 8 Series/C220 Series Chipset Family USB xHCI [8086:8c31] (rev 05)
    Subsystem: Dell Device [1028:0685]
    Kernel driver in use: xhci_hcd
00:16.0 Communication controller [0780]: Intel Corporation 8 Series/C220 Series Chipset Family MEI Controller #1 [8086:8c3a] (rev 04)
    Subsystem: Dell Device [1028:0685]
    Kernel driver in use: mei_me
00:1a.0 USB controller [0c03]: Intel Corporation 8 Series/C220 Series Chipset Family USB EHCI #2 [8086:8c2d] (rev 05)
    Subsystem: Dell Device [1028:0685]
    Kernel driver in use: ehci-pci
00:1b.0 Audio device [0403]: Intel Corporation 8 Series/C220 Series Chipset High Definition Audio Controller [8086:8c20] (rev 05)
    Subsystem: Dell Device [1028:0685]
    Kernel driver in use: snd_hda_intel
00:1c.0 PCI bridge [0604]: Intel Corporation 8 Series/C220 Series Chipset Family PCI Express Root Port #3 [8086:8c14] (rev d5)
    Kernel driver in use: pcieport
00:1c.3 PCI bridge [0604]: Intel Corporation 8 Series/C220 Series Chipset Family PCI Express Root Port #4 [8086:8c16] (rev d5)
    Kernel driver in use: pcieport
00:1c.4 PCI bridge [0604]: Intel Corporation 8 Series/C220 Series Chipset Family PCI Express Root Port #5 [8086:8c18] (rev d5)
    Kernel driver in use: pcieport
00:1d.0 USB controller [0c03]: Intel Corporation 8 Series/C220 Series Chipset Family USB EHCI #1 [8086:8c26] (rev 05)
    Subsystem: Dell Device [1028:0685]
    Kernel driver in use: ehci-pci
00:1f.0 ISA bridge [0601]: Intel Corporation HM87 Express LPC Controller [8086:8c4b] (rev 05)
    Subsystem: Dell Device [1028:0685]
    Kernel driver in use: lpc_ich
00:1f.2 RAID bus controller [0104]: Intel Corporation 82801 Mobile SATA Controller [RAID mode] [8086:282a] (rev 05)
    Subsystem: Dell Device [1028:0685]
    Kernel driver in use: ahci
00:1f.3 SMBus [0c05]: Intel Corporation 8 Series/C220 Series Chipset Family SMBus Controller [8086:8c22] (rev 05)
    Subsystem: Dell Device [1028:0685]
01:00.0 3D controller [0302]: NVIDIA Corporation GM204M [GeForce GTX 970M] [10de:13d8] (rev a1)
    Subsystem: Dell Device [1028:0685]
    Kernel driver in use: nouveau
02:00.0 Ethernet controller [0200]: Qualcomm Atheros Killer E220x Gigabit Ethernet Controller [1969:e091] (rev 10)
    Subsystem: Dell Device [1028:0685]
    Kernel driver in use: alx
03:00.0 Network controller [0280]: Qualcomm Atheros QCA6174 802.11ac Wireless Network Adapter [168c:003e] (rev 20)
    Subsystem: Bigfoot Networks, Inc. Killer N1525 Wireless-AC [1a56:1525]
04:00.0 Unassigned class [ff00]: Realtek Semiconductor Co., Ltd. RTS5227 PCI Express Card Reader [10ec:5227] (rev 01)
    Subsystem: Dell Device [1028:0685]
    Kernel driver in use: rtsx_pci