Unix & Linux Asked by guanghai lu on December 31, 2021
When I use NetworkManager command tool to scan for wireless networks the output is empty.
root@radxa:~# nmcli dev wifi list
SSID BSSID MODE FREQ RATE SIGNAL SECURITY ACTIVE
root@radxa:~#
but if use iwlist
, the scan is ok:
root@radxa:~# iwlist wlan0 scan
Cell 01 - Address: 78:A1:06:7F:CF:C9
ESSID:"olivia"
Protocol:IEEE 802.11bgn
Mode:Master
Frequency:2.462 GHz (Channel 11)
Encryption key:on
Bit Rates:300 Mb/s
IE: WPA Version 1
Group Cipher : CCMP
Pairwise Ciphers (1) : CCMP
Authentication Suites (1) : PSK
Extra:rsn_ie=30140100000fac040100000fac040100000fac020000
IE: IEEE 802.11i/WPA2 Version 1
Group Cipher : CCMP
Pairwise Ciphers (1) : CCMP
Authentication Suites (1) : PSK
Quality=0/100 Signal level=7/100
device status:
root@radxa:~# nmcli device status
DEVICE TYPE STATE
wlan0 802-11-wireless unavailable
eth0 802-3-ethernet connected
but if use nmcli connect is error:
root@radxa:~# nmcli device wifi connect "olivia" password "makeit458"
Error: No network with SSID 'olivia' found.
Linux version:
Linux version 3.0.36+ (build@radxa-x1) (gcc version 4.6.3 (Ubuntu/Linaro 4.6.3-1ubuntu5) )
#6 SMP PREEMPT Tue Aug 19 15:17:11 CST 2014
What worked for me was removing the reference to the wifi device from any of the /etc/network/interfaces
configurations.
e.g. I had a file in /etc/network/interfaces.d/something.conf
that contained
auto wlx0012456789
iface wlx... inet dhcp
(this is probably wlan0 for many users, instead of the wlx... interface I have).
Removing (or commenting out with a #
) and restarting the network manager service (sudo systemctl restart network-manager.service
) worked a treat.
Answered by Mark McDonald on December 31, 2021
I finally found the problem, wpa_supplicant was not running.
Try this:
sudo systemctl start wpa_supplicant.service
Now check the wifi list again:
nmcli dev wifi list
Connect to the network like this:
nmcli --ask connection up <ssid>
Answered by Thiago Silvino on December 31, 2021
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