How To Fix Wireless Problem On My OS / Ubuntu 12.04

Problem :

Go to menu Application -> Accessories -> Terminal.
If the terminal window is already visible, then go to the right of access as root. Inside terminal, execute the following command :
```
dnd@riyaniezt:~$ sudo -i
[sudo] password for dnd:
```

Cek Your Wireless Problem :

Inside Terminal, execute the following command:

root@riyaniezt:~# ifconfig wlan0 up
SIOCSIFFLAGS: Operation not possible due to RF-kill

Inside Terminal, execute the following command:

root@riyaniezt:~# cat /var/lib/NetworkManager/NetworkManager.state 

[main]
NetworkingEnabled=true
WirelessEnabled=false
WWANEnabled=true
WimaxEnabled=true

Inside Terminal, execute the following command:

root@riyaniezt:~# lshw -C network
  *-network               
       description: Ethernet interface
       product: AR8131 Gigabit Ethernet
       vendor: Atheros Communications Inc.
       physical id: 0
       bus info: pci@0000:01:00.0
       logical name: eth0
       version: c0
       serial: 54:53:ed:58:29:8e
       capacity: 1Gbit/s
       width: 64 bits
       clock: 33MHz
       capabilities: pm msi pciexpress vpd bus_master cap_list ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd 1000bt-fd autonegotiation
       configuration: autonegotiation=on broadcast=yes driver=atl1c driverversion=1.0.1.0-NAPI firmware=N/A latency=0 link=no multicast=yes port=twisted pair
       resources: irq:44 memory:f0100000-f013ffff ioport:2000(size=128)
  *-network DISABLED
       description: Wireless interface product: AR9285 Wireless Network Adapter (PCI-Express) 
       vendor: Atheros Communications Inc. physical 
       id: 0 bus 
       info: pci@0000:02:00.0 logical 
       name: wlan0 version: 01 
       serial: 08:ed:b9:aa:e5:71 
       width: 64 bits 
       clock: 33MHz 
       capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless 
       configuration: broadcast=yes driver=ath9k driverversion=3.2.0-32-generic firmware=N/A latency=0 link=no multicast=yes wireless=IEEE 802.11bgn 
       resources: irq:18 memory:f0000000-f000ffff

Solution :

Inside Terminal, execute the following command:
```
root@riyaniezt:~# rfkill unblock all
```

Inside Terminal, execute the following command:

root@riyaniezt:~# cat /var/lib/NetworkManager/NetworkManager.state 

[main]
NetworkingEnabled=true
WirelessEnabled=false
WWANEnabled=true
WimaxEnabled=true

Inside Terminal, execute the following command:

root@riyaniezt:~# /etc/init.d/network-manager restart
Rather than invoking init scripts through /etc/init.d, use the service(8)
utility, e.g. service network-manager restart

Since the script you are attempting to invoke has been converted to an
Upstart job, you may also use the stop(8) and then start(8) utilities,
e.g. stop network-manager ; start network-manager. The restart(8) utility is also available.
network-manager stop/waiting
network-manager start/running, process 7444

Inside Terminal, execute the following command:

root@riyaniezt:~# lshw -C network
  *-network               
       description: Ethernet interface
       product: AR8131 Gigabit Ethernet
       vendor: Atheros Communications Inc.
       physical id: 0
       bus info: pci@0000:01:00.0
       logical name: eth0
       version: c0
       serial: 54:53:ed:58:29:8e
       capacity: 1Gbit/s
       width: 64 bits
       clock: 33MHz
       capabilities: pm msi pciexpress vpd bus_master cap_list ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd 1000bt-fd autonegotiation
       configuration: autonegotiation=on broadcast=yes driver=atl1c driverversion=1.0.1.0-NAPI firmware=N/A latency=0 link=no multicast=yes port=twisted pair
       resources: irq:44 memory:f0100000-f013ffff ioport:2000(size=128)
  *-network
             description: Wireless interface
       product: AR9285 Wireless Network Adapter (PCI-Express)
       vendor: Atheros Communications Inc.
       physical id: 0
       bus info: pci@0000:02:00.0
       logical name: wlan0
       version: 01
       serial: 08:ed:b9:aa:e5:71
       width: 64 bits
       clock: 33MHz
       capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless
       configuration: broadcast=yes driver=ath9k driverversion=3.2.0-32-generic firmware=N/A latency=0 link=no multicast=yes wireless=IEEE 802.11bgn
       resources: irq:18 memory:f0000000-f000ffff

Inside Terminal, execute the following command:

root@riyaniezt:~# cat /var/lib/NetworkManager/NetworkManager.state 

[main]
NetworkingEnabled=true
WirelessEnabled=true
WWANEnabled=true
WimaxEnabled=true