我安装了全新安装的 Ubuntu 13.04 桌面版（昨天安装的）。WiFi 已经正常工作了好几个小时，突然间我无法再加载任何页面。我有另一台运行 Windows 8 的笔记本电脑，现在我将其与 Ubuntu 笔记本电脑一起使用，WiFi 工作正常。我重新启动了 WiFi 调制解调器，尽管它似乎运行良好。我断开了连接，并从 Ubuntu 顶部菜单栏重新连接到 WiFi 路由器。我重新启动了 Ubuntu 笔记本电脑，仍然无法加载任何页面，尽管看起来我已连接。大约一周前，我在全新安装 Ubuntu 13.04 时遇到了同样的问题（我已经重新安装了），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，它似乎非常不可靠。任何帮助都将不胜感激。
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)
编辑2：
$ 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
编辑3：
$ 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)
答案1
通过以下方式启动终端Shift + ALT + T
类型
sudo dhclient wlan0
完毕。