This question already has an answer here:
- Installing Broadcom Wireless Drivers 43 answers
I installed Kubuntu 18.04 as a dual boot with Windows 10, recently, on my Dell Inspiron 3543. Bluetooth is working fine, but Wi-Fi is not working. I have tried almost every possible fix available in the internet, but still could not have it up and running. Ethernet is working fine. And wifi works fine in Windows 10.
I have Broadcom Wi-Fi card.