My laptop is Dell Inspiron 17R 5720. My OS is Ubuntu 13.10. I was using WiFi before but one day it stopped working. Outputs of some commands:
enedil@enedil-Dell:~$ lspci -k | grep -A2 Broadcom
02:00.0 Network controller: Broadcom Corporation BCM43142 802.11b/g/n (rev 01)
Subsystem: Dell Wireless 1704 802.11n + BT 4.0
Kernel driver in use: wl
enedil@enedil-Dell:~$ rfkill list all
0: phy0: Wireless LAN
Soft blocked: no
Hard blocked: no
1: brcmwl-0: Wireless LAN
Soft blocked: no
Hard blocked: no
2: hci0: Bluetooth
Soft blocked: no
Hard blocked: no
enedil@enedil-Dell:~$ lsmod | grep wl
wl 4207760 0
cfg80211 480503 1 wl
lib80211 14381 2 wl,lib80211_crypt_tkip
enedil@enedil-Dell:~$ uname -a
Linux enedil-Dell 3.11.0-15-generic #23-Ubuntu SMP Mon Dec 9 18:17:04 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux
enedil@enedil-Dell:~$ lspci -vvnn | grep 14e4
02:00.0 Network controller [0280]: Broadcom Corporation BCM43142 802.11b/g/n [14e4:4365] (rev 01)
I don't know what to do, especially that yesterday, I changed my Internet connection to wireless.
EDIT: When I click on network applet (I'm using Unity) I see message under grey Wi-Fi: Device unsupported.