Preparing to unpack .../bcmwl-kernel-source_6.30.223.248+bdcom-0ubuntu8_amd64.deb ...
Unpacking bcmwl-kernel-source (6.30.223.248+bdcom-0ubuntu8) ...
Setting up bcmwl-kernel-source (6.30.223.248+bdcom-0ubuntu8) ...
Removing old bcmwl-6.30.223.248+bdcom DKMS files...
Loading new bcmwl-6.30.223.248+bdcom DKMS files...
Error! DKMS tree already contains: bcmwl-6.30.223.248+bdcom
You cannot add the same module/version combo more than once.
dpkg: error processing package bcmwl-kernel-source (--configure):
 subprocess installed post-installation script returned error exit status 3