o wifi está conectado no ubuntu mas não há acesso à internet e continua desconectando

o wifi está conectado no ubuntu mas não há acesso à internet e continua desconectando
ifconfig
eth0      Link encap:Ethernet  HWaddr 3c:97:0e:28:51:ed  
          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: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:65536  Metric:1
          RX packets:1472 errors:0 dropped:0 overruns:0 frame:0
          TX packets:1472 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:119920 (119.9 KB)  TX bytes:119920 (119.9 KB)

vmnet1    Link encap:Ethernet  HWaddr 00:50:56:c0:00:01  
          inet addr:172.16.201.1  Bcast:172.16.201.255  Mask:255.255.255.0
          inet6 addr: fe80::250:56ff:fec0:1/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:51 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)

vmnet8    Link encap:Ethernet  HWaddr 00:50:56:c0:00:08  
          inet addr:172.16.109.1  Bcast:172.16.109.255  Mask:255.255.255.0
          inet6 addr: fe80::250:56ff:fec0:8/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:51 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 c0:14:3d:c7:52:0f  
          inet6 addr: fe80::c214:3dff:fec7:520f/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:28 errors:0 dropped:0 overruns:0 frame:2585
          TX packets:91 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:1176 (1.1 KB)  TX bytes:18377 (18.3 KB)
          Interrupt:17 

$ ifconfig wlan0
wlan0     Link encap:Ethernet  HWaddr c0:14:3d:c7:52:0f  
          inet6 addr: fe80::c214:3dff:fec7:520f/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:464 errors:0 dropped:0 overruns:0 frame:36145
          TX packets:943 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:21922 (21.9 KB)  TX bytes:149032 (149.0 KB)
          Interrupt:17 

$ route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
0.0.0.0         10.220.7.253    0.0.0.0         UG    0      0        0 wlan0
10.220.0.0      0.0.0.0         255.255.248.0   U     9      0        0 wlan0
172.16.109.0    0.0.0.0         255.255.255.0   U     0      0        0 vmnet8
172.16.201.0    0.0.0.0         255.255.255.0   U     0      0        0 vmnet1

$ lspci
00:00.0 Host bridge: Intel Corporation 2nd Generation Core Processor Family DRAM Controller (rev 09)
00:02.0 VGA compatible controller: Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller (rev 09)
00:14.0 USB controller: Intel Corporation 7 Series/C210 Series Chipset Family USB xHCI Host Controller (rev 04)
00:16.0 Communication controller: Intel Corporation 7 Series/C210 Series Chipset Family MEI Controller #1 (rev 04)
00:1a.0 USB controller: Intel Corporation 7 Series/C210 Series Chipset Family USB Enhanced Host Controller #2 (rev 04)
00:1b.0 Audio device: Intel Corporation 7 Series/C210 Series Chipset Family High Definition Audio Controller (rev 04)
00:1c.0 PCI bridge: Intel Corporation 7 Series/C210 Series Chipset Family PCI Express Root Port 1 (rev c4)
00:1c.1 PCI bridge: Intel Corporation 7 Series/C210 Series Chipset Family PCI Express Root Port 2 (rev c4)
00:1c.3 PCI bridge: Intel Corporation 7 Series/C210 Series Chipset Family PCI Express Root Port 4 (rev c4)
00:1d.0 USB controller: Intel Corporation 7 Series/C210 Series Chipset Family USB Enhanced Host Controller #1 (rev 04)
00:1f.0 ISA bridge: Intel Corporation HM76 Express Chipset LPC Controller (rev 04)
00:1f.2 SATA controller: Intel Corporation 7 Series Chipset Family 6-port SATA Controller [AHCI mode] (rev 04)
00:1f.3 SMBus: Intel Corporation 7 Series/C210 Series Chipset Family SMBus Controller (rev 04)
02:00.0 Network controller: Broadcom Corporation BCM4313 802.11bgn Wireless Network Adapter (rev 01)
03:00.0 Ethernet controller: Qualcomm Atheros AR8162 Fast Ethernet (rev 

$ ping -c5 google.com
ping: unknown host google.com

Responder1

Sua interface sem fio (wlan0) não atribuiu nenhum endereço IP (pelo menos IPv4). Se o ponto de acesso ao qual você está se conectando tiver um servidor DHCP, verifique se você configurou sua interface para obter automaticamente o endereço IP. Outra opção é usar um endereço IP estático na sua interface sem fio. Se eu estiver errado com isso, talvez seja um problema de DNS. Tente ping 8.8.8.8em vez deping www.google.com

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