Comment 3 for bug 1405915

Also affects Lubuntu Utopic Unicorn (and incidentially all other distros with a >=3.16 kernel I've tried). There is a patch on the arch linux wiki that seems to solve the problem (At least all long downloads I started last night have finished successfully). Here is the link to the arch linux bug tracker: https://aur.archlinux.org/packages/broadcom-wl/

And here is the link to the patch: http://pastebin.com/pATazP6K

The solution involves the following steps:

* copying the patch to /usr/src/bcmwl-$(version)/patches/0020-null-pointer-crash.patch
* adding the patch into the /usr/src/bcmwl-$(version)/dkms.conf file (there are other patches referenced, just add it after the last one
* running "dkms build bcmwl-$(version) $(uname -r)" (this should re-install the module)
* rebooting the system