I have installed the driver of my external wifi rtl8821au. tried many solutions none working want to run external wifi{phy1}.
rfkill list all
0: phy0: Wireless LAN
Soft blocked: yes
Hard blocked: yes
1: phy1: Wireless LAN
Soft blocked: no
Hard blocked: no
lsusb
Bus 002 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 004: ID 2357:0120 TP-Link Archer T2U PLUS [RTL8821AU]
Bus 001 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 003 Device 003: ID 062a:4101 MosArt Semiconductor Corp. Wireless Keyboard/Mouse
Bus 003 Device 006: ID 2717:ff80 Xiaomi Inc. Mi/Redmi series (RNDIS)
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
hwinfo --wlan
~ hwinfo --wlan 
10: PCI 700.0: 0282 WLAN controller
[Created at pci.386]
Unique ID: eS2I.yQzsyLnXgP4
Parent ID: z8Q3.Qq8Ka3649VE
SysFS ID: /devices/pci0000:00/0000:00:1c.0/0000:07:00.0
SysFS BusID: 0000:07:00.0
Hardware Class: network
Model: “Foxconn International Unex DHXA-225”
Vendor: pci 0x168c “Qualcomm Atheros”
Device: pci 0x0032 “AR9485 Wireless Network Adapter”
SubVendor: pci 0x105b “Foxconn International, Inc.”
SubDevice: pci 0xe044 “Unex DHXA-225”
Revision: 0x01
Driver: “ath9k”
Driver Modules: “ath9k”, “ath9k”
Device File: wlp7s0
Features: WLAN
Memory Range: 0xc3500000-0xc357ffff (rw,non-prefetchable)
Memory Range: 0xc3580000-0xc358ffff (ro,non-prefetchable,disabled)
IRQ: 16 (no events)
HW Address: 62:c7:0f:d8:a6:74
Permanent HW Address: 08:3e:8e:b0:d4:a3
Link detected: no
WLAN channels: 1 2 3 4 5 6 7 8 9 10 11 12 13
WLAN frequencies: 2.412 2.417 2.422 2.427 2.432 2.437 2.442 2.447 2.452 2.457 2.462 2.467 2.472
WLAN encryption modes: WEP40 WEP104 TKIP CCMP
WLAN authentication modes: open sharedkey wpa-psk wpa-eap
Module Alias: “pci:v0000168Cd00000032sv0000105Bsd0000E044bc02sc80i00”
Driver Info #0:
Driver Status: ath9k is active
Driver Activation Cmd: “modprobe ath9k”
Config Status: cfg=new, avail=yes, need=no, active=unknown
Attached to: #2 (PCI bridge)
24: USB 00.0: 0282 WLAN controller
[Created at usb.122]
Unique ID: BobO.YkSvHlTxPd5
Parent ID: ADDn.4Nx_qoDfSd7
SysFS ID: /devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.2/1-1.2:1.0
SysFS BusID: 1-1.2:1.0
Hardware Class: network
Model: “TP-Link Archer T2U PLUS [RTL8821AU]”
Hotplug: USB
Vendor: usb 0x2357 “TP-Link”
Device: usb 0x0120 “Archer T2U PLUS [RTL8821AU]”
Revision: “2.00”
Serial ID: “00e04c000001”
Driver: “rtl8821au”
Driver Modules: “8821au”
Device File: wlp0s26u1u2
Features: WLAN
Speed: 480 Mbps
HW Address: ba:a7:d7:c9:c3:4e
Permanent HW Address: c0:06:c3:f6:90:45
WLAN channels: 1 2 3 4 5 6 7 8 9 10 11 36 40 44 48 52 56 60 64 100 104 108 112 116 120 124 128 132 136 140 149 153
WLAN frequencies: 2.412 2.417 2.422 2.427 2.432 2.437 2.442 2.447 2.452 2.457 2.462 5.18 5.2 5.22 5.24 5.26 5.28 5.3 5.32 5.5 5.52 5.54 5.56 5.58 5.6 5.62 5.64 5.66 5.68 5.7 5.745 5.765
WLAN bitrates: 1 2 5.5 11
WLAN encryption modes: TKIP CCMP
WLAN authentication modes: open wpa-psk wpa-eap
Module Alias: “usb:v2357p0120d0200dc00dsc00dp00icFFiscFFipFFin00”
Driver Info #0:
Driver Status: 8821au is active
Driver Activation Cmd: “modprobe 8821au”
Driver Info #1:
Driver Status: 8812au is active
Driver Activation Cmd: “modprobe 8812au”
Config Status: cfg=new, avail=yes, need=no, active=unknown
Attached to: #27 (Hub)
i am not able to enable the wifi adapter