Wifi not working after fresh install of ubuntu 14.10

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Kartic

Wifi not working after fresh install of ubuntu 14.10. However I am able to access internet using Ethernet.

Below information might be useful to you -

kartic@kartic-Vostro-2520:~$ lspci -vnn -d 14e4:
07:00.0 Network controller [0280]: Broadcom Corporation BCM43142 802.11b/g/n [14e4:4365] (rev 01)
    Subsystem: Dell Wireless 1704 802.11n + BT 4.0 [1028:0016]
    Flags: bus master, fast devsel, latency 0, IRQ 19
    Memory at f7c00000 (64-bit, non-prefetchable) [size=32K]
    Capabilities: <access denied>
    Kernel driver in use: wl


kartic@kartic-Vostro-2520:~$ iwconfig
eth0      no wireless extensions.

wlan0     IEEE 802.11abg  ESSID:off/any  
          Mode:Managed  Access Point: Not-Associated   
          Retry short limit:7   RTS thr:off   Fragment thr:off
          Power Management:on

lo        no wireless extensions.


kartic@kartic-Vostro-2520:~$ lspci -vvnn
07:00.0 Network controller [0280]: Broadcom Corporation BCM43142 802.11b/g/n [14e4:4365] (rev 01)
    Subsystem: Dell Wireless 1704 802.11n + BT 4.0 [1028:0016]
    Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
    Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
    Latency: 0, Cache Line Size: 64 bytes
    Interrupt: pin A routed to IRQ 19
    Region 0: Memory at f7c00000 (64-bit, non-prefetchable) [size=32K]
    Capabilities: <access denied>
    Kernel driver in use: wl

09:00.0 Ethernet controller [0200]: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller [10ec:8168] (rev 07)
    Subsystem: Dell Device [1028:0558]
    Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+
    Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
    Latency: 0, Cache Line Size: 64 bytes
    Interrupt: pin A routed to IRQ 40
    Region 0: I/O ports at e000 [size=256]
    Region 2: Memory at f0004000 (64-bit, prefetchable) [size=4K]
    Region 4: Memory at f0000000 (64-bit, prefetchable) [size=16K]
    Capabilities: <access denied>
    Kernel driver in use: r8169

I have read couple similar question, but nothing helped me.

Lephy

Some computers have a specie of button that activate the wireless, like Fn+F8. If it does not work, try activating the drivers at the settings. (Sorry for bad English, I am Brazilian). Hope that I solved your problem =D

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