I'm on Ubuntu 12.04 and I need to install & configure Internet connection. I want to use montor mode in Wireshark. After Ubuntu installation my wireless card was recognized but it doesn't connect to the Internet. Internal wireless card works well.

What should I do? I'm new to Linux.

PC:~$ ifconfig -a
eth0      Link encap:Ethernet  HWaddr 64:31:50:0f:d4:70  
          UP BROADCAST MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)
          Interrupt:45 Base address:0x8000 

eth1      Link encap:Ethernet  HWaddr e0:2a:82:aa:2d:3e  
          inet addr:192.168.0.101  Bcast:192.168.0.255  Mask:255.255.255.0
          inet6 addr: fe80::e22a:82ff:feaa:2d3e/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:20978 errors:0 dropped:0 overruns:0 frame:364651
          TX packets:20949 errors:171 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:19299119 (19.2 MB)  TX bytes:3024858 (3.0 MB)
          Interrupt:19 

lo        Link encap:Local Loopback  
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:4788 errors:0 dropped:0 overruns:0 frame:0
          TX packets:4788 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:387017 (387.0 KB)  TX bytes:387017 (387.0 KB)

wlan1     Link encap:Ethernet  HWaddr 00:1f:1f:44:c1:a4  
          UP BROADCAST MULTICAST  MTU:1500  Metric:1
          RX packets:10508 errors:0 dropped:0 overruns:0 frame:0
          TX packets:6143 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:14831319 (14.8 MB)  TX bytes:644606 (644.6 KB)

PC:~$ iwconfig
lo        no wireless extensions.

wlan1     IEEE 802.11bg  ESSID:off/any  
          Mode:Managed  Access Point: Not-Associated   Tx-Power=20 dBm   
          Retry  long limit:7   RTS thr:off   Fragment thr:off
          Power Management:on

eth1      IEEE 802.11  Access Point: Not-Associated   
          Link Quality:5  Signal level:225  Noise level:162
          Rx invalid nwid:0  invalid crypt:0  invalid misc:0

eth0      no wireless extensions.