No Wi-Fi Adapter Found Ubuntu 20.04

networking drivers usb 20.04 network-manager

7,007

Welcome to Ask Ubuntu!

With the ethernet connected, please open a terminal (Ctrl+Alt+t) and do:

sudo apt update
sudo apt install build-essential git dkms
git clone https://github.com/aircrack-ng/rtl8812au.git
cd rtl8812au/
sudo make dkms_install

Detach the ethernet and reboot. You will probably need to disable Secure Boot in the EFI/BIOS.

Your wireless should now be working.

7,007

David Walden

2005 - 2006 Part-time instructor: Aviation Science. Private Pilot Ground School. Instrument Rating Airplane Ground School. Ground Trainer (Instrument) Instructor. Calibrated school's Frasca Model 132 Flight Training Device, Updated Navaid database and backed up hard drives. FAA Airman Knowledge Test Proctor: Configured Testing Center Computers for FAA AKTD (Airman Knowledge Test Delivery), trained Testing Center Personnel on AKTD. 1995 Pilot-in-Command: company's Cessna 340-A, twin-engine, pressurized aircraft. When not flying was in training to program and operate CNC Lathes for threading oil-field pipe. 1988 - 1994 Provided pilot services in single and multi-engine general aviation aircraft; provided primary, multi-engine and instrument flight instruction; assisted A&P mechanics in repair and inspection of general aviation aircraft, provided computer consulting and technical support. 1985 - 1988 Corporate pilot, Beech King Air C90. Pilot-in-Command, corporate and charter flight operations in twin-engine executive turboprop. 1985 First Officer, Jetstream 31. Commuter airline originating at DFW International Airport. Was recommended for Captain's check-ride after four months with the company. Ground and flight training conducted by British Aerospace, Ltd. January 1985 to April, 1985: Chief Pilot and Director of Operations. December 1984 to January, 1985: Chief Pilot. April, 1984 to December, 1984: Director of Training, Check-Airman. September, 1983 to April, 1984: First Officer. DHC6-300, Be99, PA31T3. June, 1983 to September, 1983: Air Taxi Pilot, Flight Instructor 1976 Flight Instructor, Flight Simulator Sales. Demonstrated the ATC-510 Flight Simulator. CERTIFICATES Airline Transport Pilot, Airplanes Single and Multiengine Land. Certificated Flight Instructor, Airplane Single and Multiengine, Instrument (expired). Ground Instructor, Advanced, Instrument. EDUCATION / TRAINING Courses towards BSME  University of Houston, Houston, TX Courses in Calculus and Analytic Geometry  Harvard Extension School, Cambridge, MA Numerous Technical, Project Planning/Management and Quality Assurance/Testing training seminars

Updated on September 18, 2022

Comments

David Walden over 1 year

System: Dell Precision T3400 dual-boot Windows 10/Ubuntu. The system is connected via Ethernet to the internet at the moment. After update to Ubuntu 20.04 I am experiencing "No Wi-Fi Adapter Found" when attempting to use the EDUP EP-AC1661 Wi-Fi adapter. I have downloaded the Linux driver for this adapter from http://www.szedup.com/ep-ac1661/, have extracted the archives and double-clicked on all of the install.sh files in the RTL8821CU_WiFi_linux_v5.2.5.1_22211_COEX20170310-1212.20170517 folder. I have searched Synaptic forRTL8821CU but Synaptic returned: "Could not download all repository indexes" I have tried following the suggestions from articles resulting from the search for "No Wi-Fi Adaper Found Ubuntu 20.04" sources to no avail, most likely due to my lack of expertise with Linux:

Output from "wireless-info.txt" follows:

########## wireless info START ##########

Report from: 21 Nov 2020 14:57 CST -0600

Booted last: 21 Nov 2020 00:00 CST -0600

Script from: 22 Oct 2018 03:34 UTC +0000

##### release ###########################

Distributor ID: Ubuntu
Description:    Ubuntu 20.04.1 LTS
Release:    20.04
Codename:   focal

##### kernel ############################

Linux 5.4.0-54-generic #60-Ubuntu SMP Fri Nov 6 10:37:59 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux

Parameters: ro, quiet, splash, vt.handoff=7

##### desktop ###########################

Ubuntu

##### lspci #############################

04:00.0 Ethernet controller [0200]: Broadcom Inc. and subsidiaries NetXtreme BCM5754 Gigabit Ethernet PCI Express [14e4:167a] (rev 02)
    Subsystem: Dell Precision T3400 [1028:0214]
    Kernel driver in use: tg3

##### lsusb #############################

Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 008 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 007 Device 002: ID 046d:c52b Logitech, Inc. Unifying Receiver
Bus 007 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 006 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 001 Device 004: ID 0bda:0811 Realtek Semiconductor Corp. 802.11ac WLAN Adapter 
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 004 Device 002: ID 0461:0010 Primax Electronics, Ltd HP PR1101U / Primax PMX-KPR1101U Keyboard
Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub

##### PCMCIA card info ##################

##### rfkill ############################

##### secure boot #######################

'mokutil' is not installed (package "mokutil").

##### lsmod #############################

##### interfaces ########################

[/etc/network/interfaces]
auto lo
iface lo inet loopback

##### ifconfig ##########################

1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback <MAC address> brd <MAC address>
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
2: enp4s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000
    link/ether <MAC 'enp4s0' [IF1]> brd <MAC address>
    inet 192.168.1.84/24 brd 192.168.1.255 scope global dynamic noprefixroute enp4s0
       valid_lft 82672sec preferred_lft 82672sec
    inet6 2600:1700:67b2:36a0::47/128 scope global dynamic noprefixroute 
       valid_lft 3524sec preferred_lft 3524sec
    inet6 fd2d:9091:5573:1:a903:bdb7:a9e5:ab4/64 scope global temporary dynamic 
       valid_lft 6899sec preferred_lft 6899sec
    inet6 fd2d:9091:5573:1:5a74:a87b:36cd:ca46/64 scope global dynamic mngtmpaddr noprefixroute 
       valid_lft 6899sec preferred_lft 6899sec
    inet6 2600:1700:67b2:36a0:a903:bdb7:a9e5:ab4/64 scope global temporary dynamic 
       valid_lft 3330sec preferred_lft 3330sec
    inet6 2600:1700:67b2:36a0:2f20:5b7d:8e25:350b/64 scope global dynamic mngtmpaddr noprefixroute 
       valid_lft 3330sec preferred_lft 3330sec
    inet6 fe80::51fa:9873:3a0d:92e9/64 scope link noprefixroute 
       valid_lft forever preferred_lft forever

##### iwconfig ##########################

enp4s0    no wireless extensions.

lo        no wireless extensions.

##### route #############################

default via 192.168.1.254 dev enp4s0 proto dhcp metric 100 
169.254.0.0/16 dev enp4s0 scope link metric 1000 
192.168.1.0/24 dev enp4s0 proto kernel scope link src 192.168.1.84 metric 100 

##### resolv.conf #######################

[777 root '/etc/resolv.conf' -> '../run/systemd/resolve/stub-resolv.conf']

nameserver 127.0.0.53
options edns0 trust-ad
search attlocal.net

##### network managers ##################

Installed:

    NetworkManager

Running:

root         795       1  0 10:18 ?        00:00:01 /usr/sbin/NetworkManager --no-daemon

##### NetworkManager info ###############

GENERAL.DEVICE:                         enp4s0
GENERAL.TYPE:                           ethernet
GENERAL.NM-TYPE:                        NMDeviceEthernet
GENERAL.DBUS-PATH:                      /org/freedesktop/NetworkManager/Devices/2
GENERAL.VENDOR:                         Broadcom Inc. and subsidiaries
GENERAL.PRODUCT:                        NetXtreme BCM5754 Gigabit Ethernet PCI Express (Precision T3400)
GENERAL.DRIVER:                         tg3
GENERAL.DRIVER-VERSION:                 3.137
GENERAL.FIRMWARE-VERSION:               5754-v3.24
GENERAL.HWADDR:                         <MAC 'enp4s0' [IF1]>
GENERAL.MTU:                            1500
GENERAL.STATE:                          100 (connected)
GENERAL.REASON:                         0 (No reason given)
GENERAL.IP4-CONNECTIVITY:               4 (full)
GENERAL.IP6-CONNECTIVITY:               3 (limited)
GENERAL.UDI:                            /sys/devices/pci0000:00/0000:00:1c.5/0000:04:00.0/net/enp4s0
GENERAL.IP-IFACE:                       enp4s0
GENERAL.IS-SOFTWARE:                    no
GENERAL.NM-MANAGED:                     yes
GENERAL.AUTOCONNECT:                    yes
GENERAL.FIRMWARE-MISSING:               no
GENERAL.NM-PLUGIN-MISSING:              no
GENERAL.PHYS-PORT-ID:                   --
GENERAL.CONNECTION:                     Wired connection 1
GENERAL.CON-UUID:                       6ab51d0b-c1ad-3105-9293-afaab89a26d1
GENERAL.CON-PATH:                       /org/freedesktop/NetworkManager/ActiveConnection/2
GENERAL.METERED:                        no (guessed)
CAPABILITIES.CARRIER-DETECT:            yes
CAPABILITIES.SPEED:                     1000 Mb/s
CAPABILITIES.IS-SOFTWARE:               no
CAPABILITIES.SRIOV:                     no
INTERFACE-FLAGS.UP:                     yes
INTERFACE-FLAGS.LOWER-UP:               yes
INTERFACE-FLAGS.CARRIER:                yes
WIRED-PROPERTIES.CARRIER:               on
IP4.ADDRESS[1]:                         192.168.1.84/24
IP4.GATEWAY:                            192.168.1.254
IP4.ROUTE[1]:                           dst = 0.0.0.0/0, nh = 192.168.1.254, mt = 100
IP4.ROUTE[2]:                           dst = 192.168.1.0/24, nh = 0.0.0.0, mt = 100
IP4.ROUTE[3]:                           dst = 169.254.0.0/16, nh = 0.0.0.0, mt = 1000
IP4.DNS[1]:                             192.168.1.254
IP4.DOMAIN[1]:                          attlocal.net
DHCP4.OPTION[1]:                        dhcp_lease_time = 86400
DHCP4.OPTION[2]:                        domain_name = attlocal.net
DHCP4.OPTION[3]:                        domain_name_servers = 192.168.1.254
DHCP4.OPTION[4]:                        expiry = 1606074945
DHCP4.OPTION[5]:                        ip_address = 192.168.1.84
DHCP4.OPTION[6]:                        requested_broadcast_address = 1
DHCP4.OPTION[7]:                        requested_domain_name = 1
DHCP4.OPTION[8]:                        requested_domain_name_servers = 1
DHCP4.OPTION[9]:                        requested_domain_search = 1
DHCP4.OPTION[10]:                       requested_host_name = 1
DHCP4.OPTION[11]:                       requested_interface_mtu = 1
DHCP4.OPTION[12]:                       requested_ms_classless_static_routes = 1
DHCP4.OPTION[13]:                       requested_nis_domain = 1
DHCP4.OPTION[14]:                       requested_nis_servers = 1
DHCP4.OPTION[15]:                       requested_ntp_servers = 1
DHCP4.OPTION[16]:                       requested_rfc3442_classless_static_routes = 1
DHCP4.OPTION[17]:                       requested_root_path = 1
DHCP4.OPTION[18]:                       requested_routers = 1
DHCP4.OPTION[19]:                       requested_static_routes = 1
DHCP4.OPTION[20]:                       requested_subnet_mask = 1
DHCP4.OPTION[21]:                       requested_time_offset = 1
DHCP4.OPTION[22]:                       requested_wpad = 1
DHCP4.OPTION[23]:                       routers = 192.168.1.254
DHCP4.OPTION[24]:                       subnet_mask = 255.255.255.0
IP6.ADDRESS[1]:                         2600:1700:67b2:36a0::47/128
IP6.ADDRESS[2]:                         2600:1700:67b2:36a0:a903:bdb7:a9e5:ab4/64
IP6.ADDRESS[3]:                         fd2d:9091:5573:1:a903:bdb7:a9e5:ab4/64
IP6.ADDRESS[4]:                         2600:1700:67b2:36a0:2f20:5b7d:8e25:350b/64
IP6.ADDRESS[5]:                         fd2d:9091:5573:1:5a74:a87b:36cd:ca46/64
IP6.ADDRESS[6]:                         fe80::51fa:9873:3a0d:92e9/64
IP6.GATEWAY:                            fe80::8a96:4eff:fe19:63b0
IP6.ROUTE[1]:                           dst = fd2d:9091:5573:1::/64, nh = ::, mt = 100
IP6.ROUTE[2]:                           dst = 2600:1700:67b2:36a0::/60, nh = fe80::8a96:4eff:fe19:63b0, mt = 100
IP6.ROUTE[3]:                           dst = 2600:1700:67b2:36a0::/64, nh = ::, mt = 100
IP6.ROUTE[4]:                           dst = ::/0, nh = fe80::8a96:4eff:fe19:63b0, mt = 20100
IP6.ROUTE[5]:                           dst = 2600:1700:67b2:36a0::47/128, nh = ::, mt = 100
IP6.ROUTE[6]:                           dst = fe80::/64, nh = ::, mt = 100
IP6.ROUTE[7]:                           dst = ff00::/8, nh = ::, mt = 256, table=255
IP6.DNS[1]:                             2600:1700:67b2:36a0::1
DHCP6.OPTION[1]:                        dhcp6_domain_search = attlocal.net
DHCP6.OPTION[2]:                        dhcp6_name_servers = 2600:1700:67b2:36a0::1
DHCP6.OPTION[3]:                        ip6_address = 2600:1700:67b2:36a0::47
CONNECTIONS.AVAILABLE-CONNECTION-PATHS: /org/freedesktop/NetworkManager/Settings/1
CONNECTIONS.AVAILABLE-CONNECTIONS[1]:   6ab51d0b-c1ad-3105-9293-afaab89a26d1 | Wired connection 1

##### NetworkManager.state ##############

cat: /var/lib/NetworkManager/NetworkManager.state: Permission denied

##### NetworkManager config #############

[[/etc/NetworkManager/conf.d/default-wifi-powersave-on.conf]]
[connection]
wifi.powersave = 3

[[/etc/NetworkManager/NetworkManager.conf]]
[main]
plugins=ifupdown,keyfile
[ifupdown]
managed=false
[device]
wifi.scan-rand-mac-address=no

[[/usr/lib/NetworkManager/conf.d/10-dns-resolved.conf]]
[main]
dns=systemd-resolved

[[/usr/lib/NetworkManager/conf.d/10-globally-managed-devices.conf]]
[keyfile]
unmanaged-devices=*,except:type:wifi,except:type:gsm,except:type:cdma

[[/usr/lib/NetworkManager/conf.d/20-connectivity-ubuntu.conf]]
[connectivity]
uri=http://connectivity-check.ubuntu.com/

[[/usr/lib/NetworkManager/conf.d/no-mac-addr-change.conf]]
[device-mac-addr-change-wifi]
match-device=driver:rtl8723bs,driver:rtl8189es,driver:r8188eu,driver:8188eu,driver:eagle_sdio,driver:wl
wifi.scan-rand-mac-address=no

##### NetworkManager profiles ###########

##### Netplan config ####################

[/etc/netplan/01-network-manager-all.yaml]
network:
  version: 2
  renderer: NetworkManager

##### iw reg get ########################

Region: America/Chicago (based on set time zone)

global
country 00: DFS-UNSET
    (2402 - 2472 @ 40), (6, 20), (N/A)
    (2457 - 2482 @ 20), (6, 20), (N/A), AUTO-BW, PASSIVE-SCAN
    (2474 - 2494 @ 20), (6, 20), (N/A), NO-OFDM, PASSIVE-SCAN
    (5170 - 5250 @ 80), (6, 20), (N/A), AUTO-BW, PASSIVE-SCAN
    (5250 - 5330 @ 80), (6, 20), (0 ms), DFS, AUTO-BW, PASSIVE-SCAN
    (5490 - 5730 @ 160), (6, 20), (0 ms), DFS, PASSIVE-SCAN
    (5735 - 5835 @ 80), (6, 20), (N/A), PASSIVE-SCAN
    (57240 - 63720 @ 2160), (N/A, 0), (N/A)

##### iwlist channels ###################

enp4s0    no frequency information.

lo        no frequency information.

##### iwlist scan #######################

enp4s0    Interface doesn't support scanning.

lo        Interface doesn't support scanning.

##### module infos ######################

##### module parameters #################

##### /etc/modules ######################

##### modprobe options ##################

[/etc/modprobe.d/amd64-microcode-blacklist.conf]
blacklist microcode

[/etc/modprobe.d/blacklist-ath_pci.conf]
blacklist ath_pci

[/etc/modprobe.d/blacklist.conf]
blacklist evbug
blacklist usbmouse
blacklist usbkbd
blacklist eepro100
blacklist de4x5
blacklist eth1394
blacklist snd_intel8x0m
blacklist snd_aw2
blacklist prism54
blacklist bcm43xx
blacklist garmin_gps
blacklist asus_acpi
blacklist snd_pcsp
blacklist pcspkr
blacklist amd76x_edac

[/etc/modprobe.d/blacklist-rare-network.conf]
alias net-pf-3 off
alias net-pf-6 off
alias net-pf-9 off
alias net-pf-11 off
alias net-pf-12 off
alias net-pf-19 off
alias net-pf-21 off
alias net-pf-36 off

[/etc/modprobe.d/intel-microcode-blacklist.conf]
blacklist microcode

[/etc/modprobe.d/iwlwifi.conf]
remove iwlwifi \
(/sbin/lsmod | grep -o -e ^iwlmvm -e ^iwldvm -e ^iwlwifi | xargs /sbin/rmmod) \
&& /sbin/modprobe -r mac80211

[/etc/modprobe.d/rtl8188fu.conf]
options rtl8188fu rtw_power_mgnt=0 rtw_enusbss=0

##### rc.local ##########################

grep: /etc/rc.local: No such file or directory

##### pm-utils ##########################

##### udev rules ########################

##### dmesg #############################

########## wireless info END ############

Thank you for your help.

David Walden over 3 years

chili555 Awesome! Thank you!!! Disabling Secure Boot in the EFI/BIOS was not required. I very much appreciate your help.
chili555 over 3 years

Awesome, indeed! Glad it's working. If my answer has been helpful, please accept it: askubuntu.com/tour
Frank Nocke almost 3 years

How is aircrack-ng related to not detecting the wifi adapter?
chili555 almost 3 years

@FrankNocke aircrack has a driver for his device at github. If you need further clarification, please start your own new question.
faranjit over 2 years

Hi. Thank you, this solution is working but just once. After every wake up from suspend, ubuntu gives this error again,
chili555 over 2 years

@faranjit Please start your own new question.