My wifi doesn't connect

Question

I have been using ubuntu 14.10 on my old computer for about 6 months with no problem.
I just installed ubuntu 14.10 on my new laptop (some Dell laptop) and it does not detect any wifi, although there is a connection available. (When I go back an forth to windows and back to Ubuntu, windows always detects the wifi connection and Ubuntu does not). Can you please help me with this issue? Thanks a lot!!!!

＊info from comment

rfkill list all gives me:

0: dell-wifi: Wireless LAN Soft blocked: no Hard blocked: no 

lspci -nnk | grep -iA2 net gives me:

00:19.0 Ethernet controller [0200]: Intel Corporation 82579LM Gigabit Network connection [8086:1502] (rev 04) 
    Subsystem: Dell device [1028:0493]
    Kernel driver in uses e1000e 
02:00.0 Network controller [0280]: Broadcom Corporation BCM43228 802.11a/b/g/n [14e4:4359] 
    Subsystem: Dell Wireless 1530 Half-size Mini PCIe Card [1028:0011]
    Kernel driver in use: bcma-pci-bridge

Answer 1

You might need to install the proprietary driver for your Broadcom wireless card.

Please press the super key (the windows key) to open your dash, and search "driver" for it:

And open the "Additional Drivers", select the driver and click "Apply changes":