sudo apt-get update
sudo apt-get install bcmwl-kernel-source

nm-tool

sudo lsusb -v

Bus 001 Device 005: ID 13b1:003e Linksys AE6000 802.11a/b/g/n/ac Wireless Adapter [MediaTek MT7610U]

mt7610u, 0.2, 4.4.0-38-generic, x86_64: installed

T:  Bus=01 Lev=02 Prnt=02 Port=05 Cnt=03 Dev#=  5 Spd=480 MxCh= 0
D:  Ver= 2.00 Cls=00(>ifc ) Sub=00 Prot=00 MxPS=64 #Cfgs=  1
P:  Vendor=13b1 ProdID=003e Rev=01.00
S:  Manufacturer=Cisco
S:  Product=Linksys AE6000
S:  SerialNumber=0009
C:  #Ifs= 1 Cfg#= 1 Atr=a0 MxPwr=500mA
I:  If#= 0 Alt= 0 #EPs= 8 Cls=ff(vend.) Sub=ff Prot=ff Driver=(none)

sudo apt purge bcmwl-kernel-source
sudo add-apt-repository ppa:hanipouspilot/rtlwifi
sudo apt update
sudo apt install mt7610u-dkms