Support Ralink/Mediatek Wifi for kernel 4.2

What is the output of:

sudo lshw -C network; lsb_release -a; uname -a; sudo rfkill list; sudo iwlist scan | egrep 'chan|sid'

Thanks

This is the device of wifi "ASUSTek Computer, Inc. AC51 802.11a/b/g/n/ac Wireless Adapter [Mediatek MT7610/Ralink RT2870] "

I want this device work so here is the information

frankchen@FrankChenPC:~$ sudo lshw -C network
[sudo] password for frankchen:
  *-network
       description: Ethernet interface
       product: RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller
       vendor: Realtek Semiconductor Co., Ltd.
       physical id: 0
       bus info: pci@0000:03:00.0
       logical name: enp3s0
       version: 0c
       serial: 74:d0:2b:95:27:c6
       size: 10Mbit/s
       capacity: 1Gbit/s
       width: 64 bits
       clock: 33MHz
       capabilities: pm msi pciexpress msix vpd bus_master cap_list ethernet physical tp mii 10bt 10bt-fd 100bt 100bt-fd 1000bt 1000bt-fd autonegotiation
       configuration: autonegotiation=on broadcast=yes driver=r8169 driverversion=2.3LK-NAPI duplex=half firmware=rtl8168g-2_0.0.1 02/06/13 latency=0 link=no multicast=yes port=MII speed=10Mbit/s
       resources: irq:27 ioport:d000(size=256) memory:f7d00000-f7d00fff memory:f0000000-f0003fff
  *-network
       description: Ethernet interface
       physical id: 1
       logical name: enx02222704097d
       serial: 02:22:27:04:09:7d
       capabilities: ethernet physical
       configuration: broadcast=yes driver=rndis_host driverversion=22-Aug-2005 firmware=RNDIS device ip=192.168.42.241 link=yes multicast=yes
frankchen@FrankChenPC:~$ lsb_release -a; uname -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 15.10
Release: 15.10
Codename: wily
Linux FrankChenPC 4.2.0-22-generic #27-Ubuntu SMP Thu Dec 17 22:57:08 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux
frankchen@FrankChenPC:~$ sudo rfkill list
frankchen@FrankChenPC:~$ sudo iwlist scan | egrep 'chan|sid'
enp3s0 Interface doesn't support scanning.

enx02222704097d Interface doesn't support scanning.

lo Interface doesn't support scanning.

frankchen@FrankChenPC:~$ lsusb
Bus 004 Device 002: ID 8087:8000 Intel Corp.
Bus 004 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 003 Device 002: ID 8087:8008 Intel Corp.
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 005: ID 045e:0719 Microsoft Corp. Xbox 360 Wireless Adapter
Bus 001 Device 004: ID 0bb4:0f60 HTC (High Tech Computer Corp.)
Bus 001 Device 003: ID 046d:c31d Logitech, Inc. Media Keyboard K200
Bus 001 Device 007: ID 1c4f:0003 SiGma Micro HID controller
Bus 001 Device 006: ID 0b05:17d1 ASUSTek Computer, Inc. AC51 802.11a/b/g/n/ac Wireless Adapter [Mediatek MT7610/Ralink RT2870]
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
frankchen@FrankChenPC:~$

I forgot to tell you

I'm using Phone tethering

All I can suggest is report a bug. The latest mainline kernel may resolve this issue.