I just got a new notebook, a ThinkPad Edge E530, and installed Ubuntu on it. I'm pretty new to Ubuntu. On the same laptop, running Windows 7, the Wi-Fi connection works fine. Ethernet connection works both on Win7 and on Ubuntu. Only Wi-Fi on Ubuntu does not work; it connects to the Wi-Fi access point but I don't have Internet access.

My wireless card is Intel Centrino Wireless-N 2230. What can fix the problem?

EDIT:

ifconfig -a
eth0      Link encap:Ethernet  HWaddr b8:88:e3:30:72:34  
      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:43 Base address:0x8000 

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:163 errors:0 dropped:0 overruns:0 frame:0
      TX packets:163 errors:0 dropped:0 overruns:0 carrier:0
      collisions:0 txqueuelen:0 
      RX bytes:10124 (10.1 KB)  TX bytes:10124 (10.1 KB)

usb0      Link encap:Ethernet  HWaddr 02:15:e0:ec:01:00  
      UP BROADCAST RUNNING 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)

wlan0     Link encap:Ethernet  HWaddr 68:5d:43:43:71:e1  
      inet addr:192.168.2.101  Bcast:192.168.2.255  Mask:255.255.255.0
      inet6 addr: fe80::6a5d:43ff:fe43:71e1/64 Scope:Link
      UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
      RX packets:40 errors:0 dropped:0 overruns:0 frame:0
      TX packets:220 errors:0 dropped:0 overruns:0 carrier:0
      collisions:0 txqueuelen:1000 
      RX bytes:2801 (2.8 KB)  TX bytes:26230 (26.2 KB)

route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
0.0.0.0         192.168.2.1     0.0.0.0         UG    0      0        0 wlan0
169.254.0.0     0.0.0.0         255.255.0.0     U     1000   0        0 wlan0
192.168.2.0     0.0.0.0         255.255.255.0   U     2      0        0 wlan0

cat /etc/resolv.conf
# Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8)
#     DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN
nameserver 127.0.0.1

iwconfig
lo        no wireless extensions.

usb0      no wireless extensions.

wlan0     IEEE 802.11bgn  ESSID:"SATELITE"  
      Mode:Managed  Frequency:2.462 GHz  Access Point: 00:1F:1F:8D:CC:08   
      Bit Rate=1 Mb/s   Tx-Power=16 dBm   
      Retry  long limit:7   RTS thr:off   Fragment thr: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:93  Invalid misc:243   Missed beacon:0

eth0      no wireless extensions.