I just bought a dell Inspiron 300 (http://www.dell.com/us/p/inspiron-11-3137/pd)

The strange thing is that I tried with elementary Freya beta 2 (elementaryos-unstable-amd64.20150208.iso) and it correctly detects it as:

$ lshw

...

*-network

    description: Wireless interface

    product: BCM43142 802.11b/g/n

    vendor: Broadcom Corporation

    physical id: 0

    bus info: pci@0000:01:00.0

    logical name: wlan0

    version: 01

    serial: 9c:ad:97:d6:fa:1b

    width: 64 bits

    clock: 33MHz

    capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless

Elementary freya is suppossed to be based on Ubuntu 14.04, and I tried with Ubuntu 14.04.02, 14.10 and also a 15.04 beta but the wireless network just won't show up.

Any idea