I tried the below and probably this should take care :)

~$ sudo apt-get install linux-headers-lowlatency
Reading package lists... Done
Building dependency tree       
Reading state information... Done
<snipped>
The following NEW packages will be installed:
  linux-headers-lowlatency
0 upgraded, 1 newly installed, 0 to remove and 0 not upgraded.
Need to get 2,620 B of archives.
After this operation, 18.4 kB of additional disk space will be used.
Get:1 http://us.archive.ubuntu.com/ubuntu focal-updates/main amd64 
linux-headers-lowlatency amd64 5.4.0.48.51 [2,620 B]
Fetched 2,620 B in 1s (5,050 B/s)                   
Selecting previously unselected package linux-headers-lowlatency.
(Reading database ... 535146 files and directories currently installed.)
Preparing to unpack .../linux-headers-lowlatency_5.4.0.48.51_amd64.deb ...
Unpacking linux-headers-lowlatency (5.4.0.48.51) ...
Setting up linux-headers-lowlatency (5.4.0.48.51) ...

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https://bugs.launchpad.net/bugs/1898154

Title:
  Broadcom BCM4352 [14e4:43b1] Subsystem [1028:0019] No Wi-Fi Adapter
  Found Ubuntu 20.04 after updated Linux kernel to version
  5.4.0-47-lowlatency 5.4.0-48-lowlatency

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