我在 HP Presario CQ60 上安装带有 Qualcomm Atheros AR242x / AR542x 无线网络适配器（PCI-Express）的 Ubuntu 14.0.4.3 时似乎遇到了问题。
尽管已启用 wifi，但我无法扫描或查看任何无线网络，并且下面的内容似乎表明（对我这个初学者来说）无线网卡已启用、未被阻止且已安装驱动程序：
rfkill 列出全部
0: phy0: Wireless LAN
Soft blocked: no
Hard blocked: no
sudo lshw -C 网络
*-network
description: Wireless interface
product: AR242x / AR542x Wireless Network Adapter (PCI-Express)
vendor: Qualcomm Atheros
physical id: 0
bus info: pci@0000:07:00.0
logical name: wlan0
version: 01
serial: 00:23:4e:00:f5:13
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress msix bus_master cap_list ethernet physical wireless
configuration: broadcast=yes driver=ath5k driverversion=3.19.0-31-generic firmware=N/A latency=0 link=no multicast=yes wireless=IEEE 802.11bg
resources: irq:23 memory:c2000000-c200ffff
系统配置
wlan0 IEEE 802.11bg ESSID:off/any
Mode:Managed Access Point: Not-Associated Tx-Power=20 dBm
Retry short limit:7 RTS thr:off Fragment thr:off
Encryption key:off
Power Management:off
lspci -nn|grep -e 0200 -e 0280
00:0a.0 Ethernet controller [0200]: NVIDIA Corporation MCP77 Ethernet [10de:0760] (rev a2)
07:00.0 Ethernet controller [0200]: Qualcomm Atheros AR242x / AR542x Wireless Network Adapter (PCI-Express) [168c:001c] (rev 01)
请参阅lspci-nnk| grep -iA2 净
07:00.0 Ethernet controller [0200]: Qualcomm Atheros AR242x / AR542x Wireless Network Adapter (PCI-Express) [168c:001c] (rev 01)
Subsystem: Hewlett-Packard Company Device [103c:137b]
Kernel driver in use: ath5k
我搜索了几个小时，但毫无结果。我还注意到，当我使用 modprobe 命令卸载并重新安装组件时，我的无线网卡会受到硬阻止，只有将 BIOS 重置为默认值才能解决此问题。
有任何想法吗？
编辑
系统配置
eth0 no wireless extensions.
wlan0 IEEE 802.11bg ESSID:off/any
Mode:Managed Access Point: Not-Associated Tx-Power=20 dBm
Retry short limit:7 RTS thr:off Fragment thr:off
Power Management:off
lo no wireless extensions.
答案1
您似乎没有 IP 地址。尝试sudo ifconfig wlan0 192.168.1.100 up一下，看看会发生什么。