我的情况，跟他大体类似，只是上面那篇文章是ubuntu8.04，也不知发贴人解决没有，希望大家帮我看看。
我使用的是wpa128位加密的无线上网，前面的Stage 1 - Stage 4都是成功的。从Stage 5，就是DHCP开始，就出问题了：
代码： 全选
NetworkManager: <info> Activation (wlan0/wireless) Stage 2 of 5 (Device Configure) successful. Connected to wireless network 'TP-LINK_8FB800'.
NetworkManager: <info> Activation (wlan0) Stage 3 of 5 (IP Configure Start) scheduled.
NetworkManager: <info> Activation (wlan0) Stage 3 of 5 (IP Configure Start) started...
NetworkManager: <info> (wlan0): device state change: 5 -> 7
NetworkManager: <info> Activation (wlan0) Beginning DHCP transaction.
NetworkManager: <info> dhclient started with pid 11600
NetworkManager: <info> Activation (wlan0) Stage 3 of 5 (IP Configure Start) complete.
Internet Systems Consortium DHCP Client V3.1.1
Copyright 2004-2008 Internet Systems Consortium.
All rights reserved.
For info, please visit http://www.isc.org/sw/dhcp/
NetworkManager: <info> DHCP: device wlan0 state changed (null) -> preinit
Listening on LPF/wlan0/00:13:e8:69:2d:ab
Sending on LPF/wlan0/00:13:e8:69:2d:ab
Sending on Socket/fallback
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 8
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 9
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 12
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 15
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 17
NetworkManager: <info> Device 'wlan0' DHCP transaction took too long (>45s), stopping it.
NetworkManager: <info> wlan0: canceled DHCP transaction, dhcp client pid 11600
NetworkManager: <info> Activation (wlan0) Stage 4 of 5 (IP Configure Timeout) scheduled...
NetworkManager: <info> Activation (wlan0) Stage 4 of 5 (IP Configure Timeout) started...
NetworkManager: <info> Activation (wlan0/wireless): could not get IP configuration for connection 'Auto TP-LINK_8FB800'.
NetworkManager: <info> (wlan0): device state change: 7 -> 6
NetworkManager: <info> Activation (wlan0/wireless): asking for new secrets
NetworkManager: <info> Activation (wlan0) Stage 4 of 5 (IP Configure Timeout) complete.