sach@laptop:~$ sudo apt-get remove --purge bcmwl-kernel-source
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following packages will be REMOVED:
  bcmwl-kernel-source*
0 upgraded, 0 newly installed, 1 to remove and 0 not upgraded.
After this operation, 3,656 kB disk space will be freed.
Do you want to continue [Y/n]? y
(Reading database ... 145197 files and directories currently installed.)
Removing bcmwl-kernel-source ...
Removing all DKMS Modules
Done.
update-initramfs: deferring update (trigger activated)
Purging configuration files for bcmwl-kernel-source ...
update-initramfs: deferring update (trigger activated)
Processing triggers for initramfs-tools ...
update-initramfs: Generating /boot/initrd.img-3.8.0-29-generic