Hi, I had a similar problem with a samsung 305u1a. Relevant lscpi line is:
03:00.0 Network controller: Broadcom Corporation BCM4313 802.11b/g/n Wireless 
LAN Controller (rev 01)

With kubuntu 12.04.1, I found that NetworkManagement would often try to
connect to the wifi network (tethering to a smartphone), but hanging on
"Confinguring Interface" indefiinitely.  But sometimes it worked very
well, then suddenly stop (but without disconnecting). I finally noticed
a pattern, and realised that the smartphone must be in a horizontal
position. I suppose it must be something to do with either a bad antenna
in the broadcom chip, or just that the antennae must be physically
parallel or perpendicular. I haven't tested this solution with other
OSs.

tl;dr  rotate your router's wifi antenna to different positions. Maybe
that'll work.

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https://bugs.launchpad.net/bugs/991686

Title:
  WiFi not working on Samsung NP305U1A laptop

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