Ubuntu – Wifi adaptor not found ubuntu 18.04

networkingwireless

I have tried all possible solution from google but none of them seems to work.
This is the output of sudo lshw -class network

  *-network                 
   description: Ethernet interface
   product: RTL8101/2/6E PCI Express Fast/Gigabit Ethernet controller
   vendor: Realtek Semiconductor Co., Ltd.
   physical id: 0
   bus info: pci@0000:01:00.0
   logical name: enp1s0
   version: 07
   serial: 30:e1:71:8b:5a:81
   size: 10Mbit/s
   capacity: 100Mbit/s
   width: 64 bits
   clock: 33MHz
   capabilities: pm msi pciexpress msix vpd bus_master cap_list ethernet physical tp mii 10bt 10bt-fd 100bt 100bt-fd autonegotiation
   configuration: autonegotiation=on broadcast=yes driver=r8169 driverversion=2.3LK-NAPI duplex=half firmware=rtl8106e-1_0.0.1 06/29/12 latency=0 link=no multicast=yes port=MII speed=10Mbit/s
   resources: irq:16 ioport:4000(size=256) memory:b1200000-b1200fff memory:b1000000-b1003fff

*-network UNCLAIMED
   description: Network controller
   product: RTL8723BE PCIe Wireless Network Adapter
   vendor: Realtek Semiconductor Co., Ltd.
   physical id: 0
   bus info: pci@0000:02:00.0
   version: 00
   width: 64 bits
   clock: 33MHz
   capabilities: pm msi pciexpress cap_list
   configuration: latency=0
   resources: ioport:3000(size=256) memory:b1100000-b1103fff

*-network
   description: Ethernet interface
   physical id: 3
   logical name: enp0s20f0u3
   serial: 2e:ec:f6:48:14:63
   capabilities: ethernet physical
   configuration: broadcast=yes driver=rndis_host driverversion=22-Aug-2005 firmware=RNDIS device ip=192.168.42.241 link=yes multicast=yes

$ dkms status
bcmwl, 6.30.223.271+bdcom, 4.15.0-34-generic, x86_64: installed
rtl8723de, 5.1.1.8_21285.20171026_COEX20170111-1414: added 
rtlwifi-new, 0.6, 4.15.0-34-generic, x86_64: installed

Best Answer

  • This problem is because of the bug reported here (as mentioned by heynnema in the answer). Some systems are facing problems with kernel 4.15.0-33 while some with 4.15.0-34.

    Try booting with previous kernel. In the grub menu choose Advance Option for Ubuntu and from there you can boot with the previous kernel. If all works fine remove the latest kernel.

    PS: One of my friend had the same problem. Yesterday, I removed the latest kernel and booted with the previous one and all worked fine. In his case bug was with 4.15.0-34.

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