Comment 20 for bug 1456585

I managed to install the 4.1.0 rc4 kernel
uname -a
Linux xps13 4.1.0-040100rc4-generic #201505181436 SMP Mon May 18 18:38:10 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux

but building the Broadcom wl module failed, the make.log is attached.

There is no wireless at all on this kernel

ullix@xps13:~$ sudo apt-get install --reinstall bcmwl-kernel-source
[sudo] password for ullix:
Reading package lists... Done
Building dependency tree
Reading state information... Done
0 upgraded, 0 newly installed, 1 reinstalled, 0 to remove and 0 not upgraded.
Need to get 1.512 kB of archives.
After this operation, 0 B of additional disk space will be used.
Get:1 http://archive.ubuntu.com/ubuntu/ trusty-updates/restricted bcmwl-kernel-source amd64 6.30.223.248+bdcom-0ubuntu0.1 [1.512 kB]
Fetched 1.512 kB in 1s (1.007 kB/s)
(Reading database ... 355279 files and directories currently installed.)
Preparing to unpack .../bcmwl-kernel-source_6.30.223.248+bdcom-0ubuntu0.1_amd64.deb ...
Removing all DKMS Modules
Done.
Unpacking bcmwl-kernel-source (6.30.223.248+bdcom-0ubuntu0.1) over (6.30.223.248+bdcom-0ubuntu0.1) ...
Setting up bcmwl-kernel-source (6.30.223.248+bdcom-0ubuntu0.1) ...
Loading new bcmwl-6.30.223.248+bdcom DKMS files...
Building only for 4.1.0-040100rc4-generic
Building for architecture x86_64
Building initial module for 4.1.0-040100rc4-generic

ERROR (dkms apport): kernel package linux-headers-4.1.0-040100rc4-generic is not supported
Error! Bad return status for module build on kernel: 4.1.0-040100rc4-generic (x86_64)
Consult /var/lib/dkms/bcmwl/6.30.223.248+bdcom/build/make.log for more information.

modprobe: FATAL: Module wl not found.
update-initramfs: deferring update (trigger activated)
Processing triggers for initramfs-tools (0.103ubuntu4.2) ...
update-initramfs: Generating /boot/initrd.img-4.1.0-040100rc4-generic