ubuntu 无线上网

最近在dell vostro 1088上装了ubuntu 9.04，发现不能无线上网。
lspci -v

0c:00.0 Network controller: Atheros Communications Inc. AR9285 Wireless Network Adapter (PCI-Express) (rev 01)
Subsystem: Device 1a32:0305
Flags: bus master, fast devsel, latency 0, IRQ 17
Memory at f6cf0000 (64-bit, non-prefetchable) [size=64K]
Capabilities: [40] Power Management version 3
Capabilities: [50] Message Signalled Interrupts: Mask- 64bit- Queue=0/0 Enable-
Capabilities: [60] Express Legacy Endpoint, MSI 00
Capabilities: [100] Advanced Error Reporting
Capabilities: [140] Virtual Channel
Capabilities: [160] Device Serial Number 12-14-24-ff-ff-17-15-00
Capabilities: [170] Power Budgeting
Kernel driver in use: ath9k
Kernel modules: ath9k

google了下，发现网上有个帖子跟自己的
情况一模一样，，说的是内核版本太低，2.6.29或
以上的版本才有Atheros AR9285的驱动，需要升级内核的无线驱动模块。
ubuntu有更简单的方法
sudo apt-get install linux-backports-modules-jaunty