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I recently installed Ubuntu on my Lenovo T440 Thinkpad laptop. WiFi on Windows 10 works fine but on Ubuntu 18.04.2 it's showing the WiFi connections but not working despite providing id/password.

Output of nmcli d:

Device    Type      State         Connection 
wlp3s0    wifi      disconnected   -- 
enp0s25   ethernet  unavailable    -- 
lo        loopback  unmanaged      --

$ sudo lshw -short -class network 
H/W Path        Device      Class     Description 
/0/100/19       enp0s25     network   ethernet connection I218-LM 
/0/100/lc.1/0   wlp3s0      network   wirless 7260

$ networkctl status 
Warning System - networkd is not running, output will be incomplete 
. state: n/a

$ rfkill 
ID  Type       Device                 Soft      Hard 
0   bluetooth  tpacpi_bluetooth_sw    blocked   unblocked 
2   wlan       phyo                   unblocked unblocked

$ ls -1 /etc/resolv.conf
/etc/resolv.conf 

$ dmesg | grep -E wlp3s0
[    4. 865173]  iwlwifi 0000:03:00.0 wlp3s0: renamed from wlan0
[    6. 307818]  IPv6: ADDRCONF (NETDEV_UP): wlp3s0: link is not ready
[    6. 543756]  IPv6: ADDRCONF (NETDEV_UP): wlp3s0: link is not ready
[    6. 617398]  IPv6: ADDRCONF (NETDEV_UP): wlp3s0: link is not ready

$ lspci -knn | grep -A4 -i "network Controller"
03:00.0 Network controller [0280]: Intel Corporation wireless 7260 [8086:c270]
Kernel modules: iwlwifi

$ cat /var/lib/NetworkManager/NetworkManager.state
[main]
NetworkingEnabled=true
WirelessEnabled=true
WWANEnabled=true

Output of sudo lshw -C network | grep -i "Wireless interface" -A12 -B1:

description: Wireless interface
product: Wireless 7260
vendor: Intel Corporation
physical id: 0
bus info: pci@0000:03:00.0
logical name: wlp3s0
version: 83
serial: 28:b2:bd:7b:ef:3f
width: 64 bits
clock: 33MHZ
capabilities: pm mst pciexpress bus_master cap_list ethernet physical wireless
configuration: broadcast=yes driver=iwlwifi driverversion=4.18.0-15 generic firmware=17.948900127.0 latency=0 link=0 multicast=yes wireless=IEEE 802.11
resources: irq: 49 memory: f0400000-f0401fff

Output of ip link | grep -A2 wlp3s0:

3: wlp3s0: <NO CARRIER, BROADCAST, MULTICAST, UP> mtu 1500 qdisc mq state DOWN mode link/ether 28:b2:bd:7b:ef:3f brd ff:ff:ff:ff:ff:ff

How do I use WiFi properly?

@Marmayogi, I'm available between 1030am to 0300pm from Monday to Thursday. Please suggest date and time to join chatroom.

Thanking you in advance.

  • Please edit your question and post output of the following commands: 1. nmcli d, 2. sudo lshw -short -class network, 3. networkctl status and 4. rfkill, 5. ls -l /etc/resolv.conf – Marmayogi May 6 at 11:39
  • Hi Marmayogi, I recently installed the Ubuntu on my laptop on Lenovo T440 Thinkpad laptop. Wifi on Windows 10 works fine but on Ubuntu 18.04.2 it's not working despite providing id/password. output of commands you shared are stated below nmcli d= Device Type State Connection wlp3s 0 wifi disconnected -- enp0s25 ethernet unavailable -- lo loopback unmanaged -- – Asif Khan May 8 at 7:13
  • Continued..... sudo lshw -short -class network H/W Path Device Class Description /0/100/19 enp0s25 network ethernet connection I218-LM /0/100/lc.1/0 wlp3s0 network wirless 7260 networkctl status Warning System - networkd is not running, output will be incomplete . state: n/a – Asif Khan May 8 at 7:14
  • Continued..... rfkill ID Type Device Soft Hard 0 bluetooth tpacpi_bluetooth_sw blocked unblocked 2 wlan phyo unblocked unblocked ls -1 /etc/resolv.conf /etc/resolv.cong Please help as I cannot use wifi... Kind regards Asif Khan – Asif Khan May 8 at 7:14
  • Instead of pasting the output of commands in the comments, please post it into your question by editing it . Use edit option under the question by clicking it! It is really unreadable from comments! – Marmayogi May 9 at 1:58

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