I just recently installed Xubuntu 14.04 on dual boot in my Lenovo G450 laptop. For some reason, I can only connect to the internet on an ethernet cable since the Network Manager fails to detect any wifi signal, be it mine or the neighbors'. The service providers for my wifi and the neighbors are the same, so they should have WPA2-PSK. The laptop can connect to wifi just fine when I boot into Windows 7.
I've been searching for solutions on the Net, but most of them seem situational and I'm not sure which is applicable. I'm also completely new to Ubuntu and have only been practicing very basic commands on the terminal for the last few days, so I also don't want to mess around with solutions that may end up doing more harm than good due to misapplication.
lspci
in terminal?04:00.0 Network controller: Broadcom Corporation BCM4312 802.11b/g LP-PHY (rev 01) 07:00.0 Ethernet controller: Broadcom Corporation NetLink BCM5906M Fast Ethernet PCI Express (rev 02)