how to fix "No wifi adapter found" issue in Ubuntu 20.04.2.0 LTS

drivers

I have recently installed Ubuntu 20.04.2.0 LTS as a dual OS along with windows 10, for some reason my wifi adapter is not being recognized in Ubuntu. In windows 10 the wifi adapter(USB) works fine and the light blinks but in Ubuntu the WiFi adapter(USB) is not recognized(no light). How do I fix this issue?

result of running command "lshw -C network":

*-network                 
      description: Ethernet interface
      product: RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller
      vendor: Realtek Semiconductor Co., Ltd.
      physical id: 0
      bus info: pci@0000:22:00.0
      logical name: enp34s0
      version: 15
      serial: 2c:f0:5d:89:0f:7c
      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 driverversion=5.8.0-53-generic duplex=full firmware=rtl8168h-2_0.0.2 02/26/15 ip=192.168.0.41 latency=0 link=yes multicast=yes port=MII speed=1Gbit/s
      resources: irq:36 ioport:f000(size=256) memory:fcb04000-fcb04fff memory:fcb00000-fcb03fff

Out put of lsusb:

Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 003 Device 002: ID 1532:0064 Razer USA, Ltd Razer Basilisk
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 003: ID 2357:012d TP-Link 802.11ac NIC
Bus 001 Device 004: ID 0951:16bf Kingston Technology USB2.0 HUB
Bus 001 Device 002: ID 214b:7250  USB2.0 HUB
Bus 001 Device 005: ID 0d8c:0012 C-Media Electronics, Inc. USB Audio Device
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

I am using TP-link AC1300 USB adapter

From the Device ID that you've posted:

Bus 001 Device 003: ID 2357:012d TP-Link 802.11ac NIC

you need Realtek RTL8812BU drivers for your TP-Link Archer T3U USB wireless adapter.

You can install the drivers from Cilynx's GitHub repo for RTL88x2BU.

As detailed in the repo, you can install the drivers using DKMS installation method:

git clone https://github.com/cilynx/rtl88x2bu.git
cd rtl88x2bu
VER=$(sed -n 's/\PACKAGE_VERSION="\(.*\)"/\1/p' dkms.conf)
sudo rsync -rvhP ./ /usr/src/rtl88x2bu-${VER}
sudo dkms add -m rtl88x2bu -v ${VER}
sudo dkms build -m rtl88x2bu -v ${VER}
sudo dkms install -m rtl88x2bu -v ${VER}
sudo modprobe 88x2bu

Edit:

Even after installing the drivers, if you get errors like:

Activation of network connection failed or the system keep asking for password again and again,

it's worth changing some of the router settings.

(1) If the Wireless Network Mode is on Mixed/Auto, you could try changing it to N-only and/or AC-only

(2) Try changing Wireless channel

(3) Set wireless security to WPA2-PSK with AES

how to fix "No wifi adapter found" issue in Ubuntu 20.04.2.0 LTS

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