Just a comment on your last guess:

The output I posted was really the output from lspci. I noticed as well
this was not the output I get on other kernels for this command. However
on other kernels all pci are claimed so the unclaimed status of one pci
may explain the different output.

Definitely there is something wrong with kernel 4.15.

Next thing I will try is purging and re-installing bcmwl-kernel-source
package within kernel 4.15, as I installed it in kernel 4.13.

I realized as well that package broadcom-sta-dkms was not installed and
may have impaired the dkms update. I installed it yesterday along with
broadcom-sta-source broadcom-sta-common. When installing a new kernel
this source is used to build the new dkms wl module. However there is
nochange and I still get the dkms error when installing 4.15.

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  Broadcom B43 Wireless Driver Not Functional after Update to Linux
  Kernel 4.15

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