I reproduced this scenario on an Ubuntu live system in kvm with -net none, and removing the CD-ROM source. It failed in exactly the same way. I fixed the crash, and now it fails gracefully. Also, after re-adding the CD-ROM source, the driver was installed successfully. So for now I assume that this crash fix, plus you adding bcmwl-kernel-source to the DVD ought to be sufficient.
I reproduced this scenario on an Ubuntu live system in kvm with -net none, and removing the CD-ROM source. It failed in exactly the same way. I fixed the crash, and now it fails gracefully. Also, after re-adding the CD-ROM source, the driver was installed successfully. So for now I assume that this crash fix, plus you adding bcmwl-kernel-source to the DVD ought to be sufficient.
If not, please follow up here.
Thanks!