Ubuntu 13.04，连接到WiFi，但没有互联网接入
我有一个全新安装的Ubuntu 13.04桌面（昨天安装）。 WiFi已经工作了好几个小时，我突然无法加载任何页面。 我有另一台运行Windows 8的笔记本电脑，我现在正在我的Ubuntu笔记本电脑旁边使用，而wifi工作正常。 我已经重新启动了我的wifi调制解调器，尽管它似乎运行正常。 我已断开连接，从Ubuntu顶部菜单栏重新连接到我的wifi路由器。 我重新启动了我的Ubuntu笔记本电脑，仍然无法加载任何页面，虽然它看起来像我已连接。 一周前我遇到了同样的问题，新安装的Ubuntu 13.04（我已经重新安装），大约半小时后问题就消失了。 当我的Windows笔记本电脑工作正常时，似乎相当不可靠。 任何帮助，将不胜感激。
编辑：
$ ping -c5 8.8.8.8 PING 8.8.8.8 (8.8.8.8) 56(84) bytes of data. --- 8.8.8.8 ping statistics --- 5 packets transmitted, 0 received, 100% packet loss, time 4031ms $ sudo lshw -class network *-network description: Wireless interface product: AR9285 Wireless Network Adapter (PCI-Express) vendor: Atheros Communications Inc. physical id: 0 bus info: pci@0000:03:00.0 logical name: wlan0 version: 01 serial: e0:b9:a5:2d:1f:bf width: 64 bits clock: 33MHz capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless configuration: broadcast=yes driver=ath9k driverversion=3.8.0-26-generic firmware=N/A latency=0 link=yes multicast=yes wireless=IEEE 802.11bgn resources: irq:17 memory:de700000-de70ffff *-network description: Ethernet interface product: RTL8111/8168 PCI Express Gigabit Ethernet controller vendor: Realtek Semiconductor Co., Ltd. physical id: 0 bus info: pci@0000:05:00.0 logical name: eth0 version: 06 serial: bc:ae:c5:64:26:94 size: 10Mbit/s capacity: 1Gbit/s width: 64 bits clock: 33MHz capabilities: pm msi pciexpress msix vpd bus_master cap_list ethernet physical tp mii 10bt 10bt-fd 100bt 100bt-fd 1000bt 1000bt-fd autonegotiation configuration: autonegotiation=on broadcast=yes driver=r8169 driverversion=2.3LK-NAPI duplex=half firmware=rtl_nic/rtl8168e-2.fw latency=0 link=no multicast=yes port=MII speed=10Mbit/s resources: irq:41 ioport:9000(size=256) memory:d2104000-d2104fff memory:d2100000-d2103fff $ lspci 00:00.0 Host bridge: Intel Corporation 2nd Generation Core Processor Family DRAM Controller (rev 09) 00:01.0 PCI bridge: Intel Corporation Xeon E3-1200/2nd Generation Core Processor Family PCI Express Root Port (rev 09) 00:02.0 VGA compatible controller: Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller (rev 09) 00:16.0 Communication controller: Intel Corporation 6 Series/C200 Series Chipset Family MEI Controller #1 (rev 04) 00:1a.0 USB controller: Intel Corporation 6 Series/C200 Series Chipset Family USB Enhanced Host Controller #2 (rev 05) 00:1b.0 Audio device: Intel Corporation 6 Series/C200 Series Chipset Family High Definition Audio Controller (rev 05) 00:1c.0 PCI bridge: Intel Corporation 6 Series/C200 Series Chipset Family PCI Express Root Port 1 (rev b5) 00:1c.1 PCI bridge: Intel Corporation 6 Series/C200 Series Chipset Family PCI Express Root Port 2 (rev b5) 00:1c.3 PCI bridge: Intel Corporation 6 Series/C200 Series Chipset Family PCI Express Root Port 4 (rev b5) 00:1c.5 PCI bridge: Intel Corporation 6 Series/C200 Series Chipset Family PCI Express Root Port 6 (rev b5) 00:1d.0 USB controller: Intel Corporation 6 Series/C200 Series Chipset Family USB Enhanced Host Controller #1 (rev 05) 00:1f.0 ISA bridge: Intel Corporation HM65 Express Chipset Family LPC Controller (rev 05) 00:1f.2 SATA controller: Intel Corporation 6 Series/C200 Series Chipset Family 6 port SATA AHCI Controller (rev 05) 00:1f.3 SMBus: Intel Corporation 6 Series/C200 Series Chipset Family SMBus Controller (rev 05) 01:00.0 VGA compatible controller: NVIDIA Corporation GF108M [GeForce GT 540M] (rev a1) 02:00.0 Multimedia controller: Philips Semiconductors SAA7231 (rev ca) 03:00.0 Network controller: Atheros Communications Inc. AR9285 Wireless Network Adapter (PCI-Express) (rev 01) 04:00.0 USB controller: Fresco Logic FL1000G USB 3.0 Host Controller (rev 04) 05:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168 PCI Express Gigabit Ethernet controller (rev 06) EDIT2：
$ ifconfig eth0 Link encap:Ethernet HWaddr bc:ae:c5:64:26:94 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) 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:743 errors:0 dropped:0 overruns:0 frame:0 TX packets:743 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:50506 (50.5 KB) TX bytes:50506 (50.5 KB) wlan0 Link encap:Ethernet HWaddr e0:b9:a5:2d:1f:bf inet6 addr: fe80::e2b9:a5ff:fe2d:1fbf/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:1900 errors:0 dropped:0 overruns:0 frame:0 TX packets:982 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:457035 (457.0 KB) TX bytes:107425 (107.4 KB) $ route -n Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface 0.0.0.0 192.168.1.1 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 192.168.1.1 0.0.0.0 255.255.255.255 UH 0 0 0 wlan0
EDIT3：
$ sudo dhclient wlan0 $ ifconfig wlan0 wlan0 Link encap:Ethernet HWaddr e0:b9:a5:2d:1f:bf inet addr:192.168.1.5 Bcast:192.168.1.255 Mask:255.255.255.0 inet6 addr: fe80::e2b9:a5ff:fe2d:1fbf/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:2124 errors:0 dropped:0 overruns:0 frame:0 TX packets:1170 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:512506 (512.5 KB) TX bytes:136944 (136.9 KB)
通过Shift + ALT + T启动终端
类型
sudo dhclient wlan0
完成。