我在 Ubuntu 12.04 上设置 wifi 时遇到了问题。我上周安装了它，从那时起就遇到了与大多数人相同的问题，即连接从不稳定，并且每隔 20 秒左右就会弹出一个要求输入密码的窗口。我尝试添加，options iwlagn 11n_disable=0但/etc/modprobe.d/iwlagn.conf从未成功。在尝试此网站上的方法的过程中，我似乎已将 wifi 卡取下。
我现在有一个无人认领wlan0且未在 中显示的网络iwconfig。
$ 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.4 PCI bridge: Intel Corporation 6 Series/C200 Series Chipset Family PCI Express Root Port 5 (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 HM67 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 Device 124d (rev a1)
03:00.0 Network controller: Intel Corporation Centrino Wireless-N 1000
04:00.0 USB controller: NEC Corporation uPD720200 USB 3.0 Host Controller (rev 04)
0a:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168B PCI Express Gigabit Ethernet controller (rev 06)
$ sudo lshw -C network
*-network UNCLAIMED
description: Network controller
product: Centrino Wireless-N 1000
vendor: Intel Corporation
physical id: 0
bus info: pci@0000:03:00.0
version: 00
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress cap_list
configuration: latency=0
resources: memory:f3b00000-f3b01fff
*-network
description: Ethernet interface
product: RTL8111/8168B PCI Express Gigabit Ethernet controller
vendor: Realtek Semiconductor Co., Ltd.
physical id: 0
bus info: pci@0000:0a:00.0
logical name: eth0
version: 06
serial: 84:8f:69:b9:40:bc
size: 100Mbit/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=full firmware=rtl_nic/rtl8168e-2.fw ip=192.168.1.80 latency=0 link=yes multicast=yes port=MII speed=100Mbit/s
resources: irq:50 ioport:2000(size=256) memory:f3004000-f3004fff memory:f3000000-f3003fff
$ iwconfig
lo no wireless extensions.
eth0 no wireless extensions.
答案1
我在帖子中概述了对此的潜在解决方案https://askubuntu.com/questions/131912/wireless-not-working-on-dell-xps-17-after-installing-12-04，我把答案复制如下：
我有一台戴尔 XPS 17 (l702x)，上面有 n-1000，我想让它在 Ubuntu 12.04 下运行（安装后）。因此，大量借用这个帖子：
修复似乎涉及降级 n-1000 的固件。
请使用以下方式降级固件iwlwifi-1000-ucode-128.50.3.1.tgz（为方便起见，请将其保存到桌面）。您可以右键单击它并选择“提取”，或者在终端提示符下发出以下命令：
tar xzvf ~/Desktop/iwlwifi-1000-ucode-128.50.3.1.tgz
再次在终端中备份当前固件：
sudo mv /lib/firmware/iwlwifi-1000-5.ucode /lib/firmware/iwlwifi-1000-5.bak
现在复制下载的固件：
cd Desktop/iwlwifi-1000-ucode-128.50.3.1/
cp iwlwifi-1000-3.ucode iwlwifi-1000-5.ucode
sudo cp iwlwifi-1000-5.ucode /lib/firmware
sudo modprobe -r iwlagn
sudo modprobe iwlagn
现在让我们看看幕后发生了什么：
dmesg | tail -n20
这已在原始帖子，并且据说是一个永久性的修复（即重启后仍然有效）。
祝你好运！
干杯
富有的