Thursday, April 14, 2016

Problem in connecting Wifi in Ubuntu 14.04 LTS after upgrading?


Hi all,

Recently i upgraded my Operating System to Ubuntu 14.04 LTS from ubuntu 12.04 LTS  in my Dell Vostro laptop. But after upgrade has finished i found my wifi connection not working in Ubuntu 14.04.

I checked #ifconfig -a, but wlan0 is not listed in the list of interfaces.

After some research i found the solution.

Here i'm providing some commands to troubleshoot your wlan interface.

> Check all the wireless devices available in the system and their state (block or unblock)

#rfkill list all
1: hci0: Bluetooth
    Soft blocked: no
    Hard blocked: no

Here i did not found my Wlan device.. If wireless device installed properly the output will be

1: hci0: Bluetooth
    Soft blocked: no
    Hard blocked: no
2: phy0: Wireless LAN
    Soft blocked: no
    Hard blocked: no
3: brcmwl-0: Wireless LAN
    Soft blocked: no
    Hard blocked: no
root@mallikarjuna-Vostro-2520:~# rfkill list all
1: hci0: Bluetooth
    Soft blocked: no
    Hard blocked: no
2: phy0: Wireless LAN
    Soft blocked: no
    Hard blocked: no
3: brcmwl-0: Wireless LAN
    Soft blocked: no
    Hard blocked: no

 And make sure Wireless LAN is unblocked (blocked: no) for proper working.

>Check wireless interface is configured or not
 #iwconfg
cannot find device wlan0  

if Configured the output will be
eth0      no wireless extensions.

lo        no wireless extensions.

wlan0     IEEE 802.11abg  ESSID:"PlayOff" 
          Mode:Managed  Frequency:2.432 GHz  Access Point: 33:C7:7F:D6:FE:F0  
          Bit Rate=72 Mb/s   Tx-Power=200 dBm  
          Retry  long limit:7   RTS thr:off   Fragment thr:off
          Encryption key:off
          Power Management:off
          Link Quality=60/70  Signal level=-50 dBm 
          Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
          Tx excessive retries:0  Invalid misc:0   Missed beacon:0

>Check system log messages relating to wlan interface
#dmesg | grep -e wlan -e b43

> Check the wireless card installed in your laptop, (The following command will display the chip-id,PCI-id, kernel driver in use)

# lspci -vvnn | grep -A 9 Network 
07:00.0 Network controller [0280]: Broadcom Corporation BCM43142 802.11b/g/n [14e4:4365] (rev 01)
XXXXXXXXX........


And finally installed broadcom drivers using the following command (after installation Restart may required) through the Wired ethernet connection.

$sudo apt-get update
$sudo apt-get install bcmwl-kernel-source


Then my Wifi connected properly..








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