I just installed Odin on an older Windows 8 vintage Dell laptop. I have totally forgotten how to troubleshoot the chipset and get the kernel sources installed correctly. I’ve gotten as far as installing the BCMWL Kernel source package from AppCenter, but I am totally lost.
Have been struggling with this, too. You need to install Kernel Headers first. See this:
you might need to sudo apt-get install --reinstall bcmwl-kernel-source