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

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https://bugs.launchpad.net/bugs/1405915

Title:
  Broadcom sta driver not working correctly on BCM43142 - low signal
  recieved

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