Network unclaimed on Ubuntu

Question

Ubuntu is not able to detect Wi-Fi and also the network is unclaimed.

I don't have Ethernet cable nor any dongle is there any way I can fix it without any internet connection on my laptop.

Output of lshw -c network:

*-network UNCLAIMED     
   description: Network controller
   product: Intel Corporation
   vendor: Intel Corporation
   physical id: 0
   bus info: pci@0000:3f:00.0
   version: 78
   width: 64 bits
   clock: 33MHz
   capabilities: cap_list
   configuration: latency=0
   resources: memory:8a200000-8a201fff

Output of lspci -knn | grep Net -A3; rfkill list:

3f:00.0 Network controller [0280]: Intel Corporation Device [8086:24fd] (rev 78)
Subsystem: Intel Corporation Device [8086:1010]
40:00.0 Non-Volatile memory controller [0108]: Samsung Electronics Co     Ltd Device [144d:a804]
    Subsystem: Samsung Electronics Co Ltd Device [144d:a801]
0: ideapad_wlan: Wireless LAN
Soft blocked: no
Hard blocked: no
1: ideapad_bluetooth: Bluetooth
Soft blocked: yes
Hard blocked: no
2: hci0: Bluetooth
Soft blocked: yes
Hard blocked: no

Kernel version:

Linux yoga 4.4.0-119-generic #143-Ubuntu SMP Mon Apr 2 16:08:24 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux

Solution

You installed Ubuntu 16.04 with the original 4.4 kernel that doesn't support your new wireless adapter.

If you downloaded and installed the 16.04.4 image, it would work without any additional effort.

For now the easiest solution is to upgrade the kernel. Connect to the internet by some other means (wire, tethering, etc) and run in a terminal:

sudo apt update
sudo apt install linux-generic-hwe-16.04 linux-firmware

Reboot after the kernel packages are installed. Your wireless adapter should work.

Comments

[Harsh Rawat]

After doing the above you mentioned my wifi is working but I am having problem with shutdown and reboot (only a black screen comes and nothing happens)

[Pilot6]

There may be issues with your graphics adapter and its driver with this kernel. You can always boot with the old kernel using grub. You can also ask a new question. But I suggest to start with updating your system with sudo apt upgrade first. Or do a fresh install of 16.04.4.

[Harsh Rawat]

Did not work.I am posting it as a new question