This question already has an answer here:

This is the output of the Wireless Info Script: https://paste.ubuntu.com/p/4J2XTpxDKR/

The ouput of sudo lshw -C network is:

   *-network UNCLAIMED     
       description: Network controller
       product: BCM43142 802.11b/g/n
       vendor: Broadcom Corporation
       physical id: 0
       bus info: pci@0000:03:00.0
       version: 01
       width: 64 bits
       clock: 33MHz
       capabilities: pm msi pciexpress bus_master cap_list
       configuration: latency=0
       resources: memory:f7900000-f7907fff
       description: Ethernet interface
       product: RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller
       vendor: Realtek Semiconductor Co., Ltd.
       physical id: 0.1
       bus info: pci@0000:04:00.1
       logical name: enp4s0f1
       version: 12
       serial: 2c:56:dc:02:4a:56
       size: 10Mbit/s
       capacity: 1Gbit/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 1000bt 1000bt-fd autonegotiation
       configuration: autonegotiation=on broadcast=yes driver=r8169 driverversion=2.3LK-NAPI duplex=half firmware=rtl8411-2_0.0.1 07/08/13 latency=0 link=no multicast=yes port=MII speed=10Mbit/s
       resources: irq:19 ioport:d000(size=256) memory:f7814000-f7814fff memory:f7810000-f7813fff
       description: Ethernet interface
       physical id: 1
       logical name: enp0s20u2
       serial: 76:d4:fc:33:d8:be
       capabilities: ethernet physical
       configuration: broadcast=yes driver=rndis_host driverversion=22-Aug-2005 firmware=RNDIS device ip= link=yes multicast=yes

Also, in the additional drivers menu it says that the device is using an alternative Broadcom driver.

marked as duplicate by chili555 networking Jul 6 '18 at 0:38

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  • What is the exact response to the terminal command: sudo modprobe wl ? – chili555 Jul 5 '18 at 0:42
  • modprobe: FATAL: Module wl not found in directory /lib/modules/4.15.0-24-generic – Sanit Jul 5 '18 at 9:14
  • Please try: sudo apt install --reinstall bcmwl-kernel-source and then: sudo modprobe wl If the problem remains, please try rebooting and, at the grub prompt, boot into an earlier kernel, say -23. Does the wireless work there? Possibly related: bugs.launchpad.net/ubuntu/+source/bcmwl/+bug/1757008/+index – chili555 Jul 5 '18 at 14:23
  • @chili555 You are a lifesaver. How does one figure this stuff out? – Sanit Jul 5 '18 at 14:46
  • One figures this out by working with it every day for about fifteen years! Just to help others with the same problem, what was the fix in your case? Reinstall the driver or what? – chili555 Jul 5 '18 at 20:45