user@user-system:~$ sudo apt install  bcmwl-kernel-source
sudo: unable to resolve host user-system: No such file or directory
Reading package lists... Done
Building dependency tree       
Reading state information... Done
The following packages were automatically installed and are no longer required:
  libfuse2:i386 libwxbase2.8-0 libwxgtk2.8-0 linux-headers-4.4.0-62 linux-headers-4.4.0-62-generic
  linux-image-extra-4.4.0-57-generic linux-signed-image-4.4.0-57-generic ubuntu-core-launcher
Use 'sudo apt autoremove' to remove them.
The following NEW packages will be installed:
  bcmwl-kernel-source
0 upgraded, 1 newly installed, 0 to remove and 0 not upgraded.
Need to get 0 B/1550 kB of archives.
After this operation, 8056 kB of additional disk space will be used.
Selecting previously unselected package bcmwl-kernel-source.
(Reading database ... 652187 files and directories currently installed.)
Preparing to unpack .../bcmwl-kernel-source_6.30.223.271+bdcom-1longsleep0_amd64.deb ...
Unpacking bcmwl-kernel-source (6.30.223.271+bdcom-1longsleep0) ...
Setting up bcmwl-kernel-source (6.30.223.271+bdcom-1longsleep0) ...
Loading new bcmwl-6.30.223.271+bdcom DKMS files...
First Installation: checking all kernels...
Building only for 4.8.0-36-generic
Building for architecture x86_64
Building initial module for 4.8.0-36-generic
ERROR: Cannot create report: [Errno 17] File exists: '/var/crash/bcmwl-kernel-source.0.crash'
Error! Bad return status for module build on kernel: 4.8.0-36-generic (x86_64)
Consult /var/lib/dkms/bcmwl/6.30.223.271+bdcom/build/make.log for more information.
modprobe: FATAL: Module wl not found in directory /lib/modules/4.8.0-36-generic
update-initramfs: deferring update (trigger activated)
Processing triggers for initramfs-tools (0.122ubuntu8.8) ...
update-initramfs: Generating /boot/initrd.img-4.8.0-36-generic
W: Possible missing firmware /lib/firmware/i915/kbl_dmc_ver1_01.bin for module i915
W: Possible missing firmware /lib/firmware/i915/kbl_guc_ver9_14.bin for module i915
W: Possible missing firmware /lib/firmware/i915/bxt_guc_ver8_7.bin for module i915
W: mdadm: /etc/mdadm/mdadm.conf defines no arrays.