Ubuntu – How to get WiFi working on the Dell Inspiron 1501

I know there are other answers similar to this, I have tried those but am stuck.
In Windows my wifi LED was on, in Ubuntu it is not. Function keys are not turning it on.
There is no reference to WiFi from network manager, only:

• Ethernet network disconnected (greyed out)
• VPN connections
• enable networking (ticked)
• Connection information (greyed out)
• Edit connections

I have tried using rfkill from terminal, but nothing happens, it just goes back to command line.
I have also tried sudo rfkill, with the same result.

Should wifi work when running from the Live CD? Would like it to so I can see full extent of system.

I'd appreciate any help, but please remember I'm new. Sorry if this is too similar to other questions.

result of lspci -nnk | grep -i net is

05:00.0 Network controller [0280]: Broadcom Corporation BCM4311 802.11b/g WLAN [14e4:4311] (rev 01)
08:00.0 Ethernet controller [0200]: Broadcom Corporation BCM 4401-B0 100 Base-TX [14e4:170c] (rev 02)

The "net" is red is both lines.

Ubuntu version is 13.04 (boot from live system) and I am on a Dell Inspiron 1501.