Troubleshooting • Not connected to Wi-Fi with wlan0

Code:

$ ifconfigeth0: flags=4099<UP,BROADCAST,MULTICAST>  mtu 1500        ether e4:5f:01:e7:dc:41  txqueuelen 1000  (Ethernet)        RX packets 0  bytes 0 (0.0 B)        RX errors 0  dropped 0  overruns 0  frame 0        TX packets 0  bytes 0 (0.0 B)        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536        inet 127.0.0.1  netmask 255.0.0.0        inet6 ::1  prefixlen 128  scopeid 0x10<host>        loop  txqueuelen 1000  (Local Loopback)        RX packets 0  bytes 0 (0.0 B)        RX errors 0  dropped 0  overruns 0  frame 0        TX packets 0  bytes 0 (0.0 B)        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0usb0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500        inet 192.168.225.36  netmask 255.255.255.0  broadcast 192.168.225.255        inet6 fe80::1936:bc8e:3b64:611d  prefixlen 64  scopeid 0x20<link>        ether 02:90:79:52:16:0c  txqueuelen 1000  (Ethernet)        RX packets 12335  bytes 765386 (747.4 KiB)        RX errors 0  dropped 0  overruns 0  frame 0        TX packets 12352  bytes 940549 (918.5 KiB)        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

Code:

$ sudo iwlist wlan0 scanwlan0     Interface doesn't support scanning.

Code:

$ sudo ifconfig wlan0 upwlan0: ERROR while getting interface flags: No such device

Code:

lo        no wireless extensions.eth0      no wireless extensions.usb0      no wireless extensions.

Code:

$ grep "V" /etc/os-releaseVERSION_ID="10"VERSION="10 (buster)"VERSION_CODENAME=buster

Code:

$ dmesg | grep -i pci[    1.135572] PCI: CLS 0 bytes, default 64[    1.158950] brcm-pcie fd500000.pcie: host bridge /scb/pcie@7d500000 ranges:[    1.158981] brcm-pcie fd500000.pcie:   No bus range found for /scb/pcie@7d500000, using [bus 00-ff][    1.159063] brcm-pcie fd500000.pcie:      MEM 0x0600000000..0x063fffffff -> 0x00c0000000[    1.159152] brcm-pcie fd500000.pcie:   IB MEM 0x0000000000..0x01ffffffff -> 0x0400000000[    1.197264] brcm-pcie fd500000.pcie: link up, 5.0 GT/s PCIe x1 (SSC)[    1.197631] brcm-pcie fd500000.pcie: PCI host bridge to bus 0000:00[    1.197652] pci_bus 0000:00: root bus resource [bus 00-ff][    1.197674] pci_bus 0000:00: root bus resource [mem 0x600000000-0x63fffffff] (bus address [0xc0000000-0xffffffff])[    1.197764] pci 0000:00:00.0: [14e4:2711] type 01 class 0x060400[    1.198006] pci 0000:00:00.0: PME# supported from D0 D3hot[    1.201635] PCI: bus0: Fast back to back transfers disabled[    1.201660] pci 0000:00:00.0: bridge configuration invalid ([bus 00-00]), reconfiguring[    1.201951] pci 0000:01:00.0: [1106:3483] type 00 class 0x0c0330[    1.202023] pci 0000:01:00.0: reg 0x10: [mem 0x00000000-0x00000fff 64bit][    1.202282] pci 0000:01:00.0: PME# supported from D0 D1 D2 D3hot D3cold[    1.205845] PCI: bus1: Fast back to back transfers disabled[    1.205868] pci_bus 0000:01: busn_res: [bus 01-ff] end is updated to 01[    1.205909] pci 0000:00:00.0: BAR 8: assigned [mem 0x600000000-0x6000fffff][    1.205933] pci 0000:01:00.0: BAR 0: assigned [mem 0x600000000-0x600000fff 64bit][    1.205977] pci 0000:00:00.0: PCI bridge to [bus 01][    1.206002] pci 0000:00:00.0:   bridge window [mem 0x600000000-0x6000fffff][    1.206410] pcieport 0000:00:00.0: enabling device (0140 -> 0142)[    1.206641] pcieport 0000:00:00.0: PME: Signaling with IRQ 67[    2.315616] input: Logitech USB Receiver as /devices/platform/scb/fd500000.pcie/pci0000:00/0000:00:00.0/0000:01:00.0/usb1/1-1/1-1.1/1-1.1:1.0/0003:046D:C52B.0001/input/input0[    2.394926] input: Logitech USB Receiver Mouse as /devices/platform/scb/fd500000.pcie/pci0000:00/0000:00:00.0/0000:01:00.0/usb1/1-1/1-1.1/1-1.1:1.1/0003:046D:C52B.0002/input/input1[    2.395537] input: Logitech USB Receiver Consumer Control as /devices/platform/scb/fd500000.pcie/pci0000:00/0000:00:00.0/0000:01:00.0/usb1/1-1/1-1.1/1-1.1:1.1/0003:046D:C52B.0002/input/input2[    2.475572] input: Logitech USB Receiver System Control as /devices/platform/scb/fd500000.pcie/pci0000:00/0000:00:00.0/0000:01:00.0/usb1/1-1/1-1.1/1-1.1:1.1/0003:046D:C52B.0002/input/input3[    5.622511] input: Logitech Wireless Device PID:404d Keyboard as /devices/platform/scb/fd500000.pcie/pci0000:00/0000:00:00.0/0000:01:00.0/usb1/1-1/1-1.1/1-1.1:1.2/0003:046D:C52B.0003/0003:046D:404D.0004/input/input5[    5.623723] input: Logitech Wireless Device PID:404d Mouse as /devices/platform/scb/fd500000.pcie/pci0000:00/0000:00:00.0/0000:01:00.0/usb1/1-1/1-1.1/1-1.1:1.2/0003:046D:C52B.0003/0003:046D:404D.0004/input/input6[    5.624393] input: Logitech Wireless Device PID:404d Consumer Control as /devices/platform/scb/fd500000.pcie/pci0000:00/0000:00:00.0/0000:01:00.0/usb1/1-1/1-1.1/1-1.1:1.2/0003:046D:C52B.0003/0003:046D:404D.0004/input/input7[    5.624811] input: Logitech Wireless Device PID:404d System Control as /devices/platform/scb/fd500000.pcie/pci0000:00/0000:00:00.0/0000:01:00.0/usb1/1-1/1-1.1/1-1.1:1.2/0003:046D:C52B.0003/0003:046D:404D.0004/input/input8[    6.318047] input: Logitech K400 Plus as /devices/platform/scb/fd500000.pcie/pci0000:00/0000:00:00.0/0000:01:00.0/usb1/1-1/1-1.1/1-1.1:1.2/0003:046D:C52B.0003/0003:046D:404D.0004/input/input12

Code:

# interfaces(5) file used by ifup(8) and ifdown(8)# Please note that this file is written to be used with dhcpcd# For static IP, consult /etc/dhcpcd.conf and 'man dhcpcd.conf'# Include files from /etc/network/interfaces.d:source-directory /etc/network/interfaces.dauto wlan0iface wlan0 inet manualwpa-conf /etc/wpa_supplicant/wpa_supplicant.conf

Code:

country=GBctrl_interface=DIR=/var/run/wpa_supplicant GROUP=netdevupdate_config=1network={ssid="my ssid"psk="my wifi password"key_mgmt=WPA-PSK}