更新后无法连接到WiFi网络
我运行12.04，并且在我昨晚安装更新之前没有WiFi问题（有很多，我不知道如何看到安装的内容）。 它可能是不相关的，但它是唯一改变的东西。
我无法再连接到我的家庭WiFi网络。 有些网络（比如我的Android热点）工作正常，但连接到我们的BT Home Hub只是超时并提示进行身份validation。
笔记本电脑是HP EliteBook 8470p，它有一张’Centrino Advanced-N 6205’卡（在lshw中报道，我不确定它是否是另一张卡的品牌名称）。
这是我的系统日志中的内容，错误似乎是“无法为AP插入虚拟STA条目”：
Sep 17 16:56:43 richard-HP-EliteBook-8470p NetworkManager[998]: get_secret_flags: assertion `is_secret_prop (setting, secret_name, error)' failed Sep 17 16:56:43 richard-HP-EliteBook-8470p NetworkManager[998]: Activation (wlan0) Stage 1 of 5 (Device Prepare) scheduled... Sep 17 16:56:43 richard-HP-EliteBook-8470p NetworkManager[998]: Activation (wlan0) Stage 1 of 5 (Device Prepare) started... Sep 17 16:56:43 richard-HP-EliteBook-8470p NetworkManager[998]: (wlan0): device state change: need-auth -> prepare (reason 'none') [60 40 0] Sep 17 16:56:43 richard-HP-EliteBook-8470p NetworkManager[998]: Activation (wlan0) Stage 2 of 5 (Device Configure) scheduled... Sep 17 16:56:43 richard-HP-EliteBook-8470p NetworkManager[998]: Activation (wlan0) Stage 1 of 5 (Device Prepare) complete. Sep 17 16:56:43 richard-HP-EliteBook-8470p NetworkManager[998]: Activation (wlan0) Stage 2 of 5 (Device Configure) starting... Sep 17 16:56:43 richard-HP-EliteBook-8470p NetworkManager[998]: (wlan0): device state change: prepare -> config (reason 'none') [40 50 0] Sep 17 16:56:43 richard-HP-EliteBook-8470p NetworkManager[998]: Activation (wlan0/wireless): connection 'BTHub3-8ZRT 1' has security, and secrets exist. No new secrets needed. Sep 17 16:56:43 richard-HP-EliteBook-8470p NetworkManager[998]: Config: added 'ssid' value 'BTHub3-8ZRT' Sep 17 16:56:43 richard-HP-EliteBook-8470p NetworkManager[998]: Config: added 'scan_ssid' value '1' Sep 17 16:56:43 richard-HP-EliteBook-8470p NetworkManager[998]: Config: added 'key_mgmt' value 'NONE' Sep 17 16:56:43 richard-HP-EliteBook-8470p NetworkManager[998]: Config: added 'wep_key0' value '' Sep 17 16:56:43 richard-HP-EliteBook-8470p NetworkManager[998]: Config: added 'wep_tx_keyidx' value '0' Sep 17 16:56:43 richard-HP-EliteBook-8470p NetworkManager[998]: Activation (wlan0) Stage 2 of 5 (Device Configure) complete. Sep 17 16:56:43 richard-HP-EliteBook-8470p NetworkManager[998]: Config: set interface ap_scan to 1 Sep 17 16:56:43 richard-HP-EliteBook-8470p NetworkManager[998]: (wlan0): supplicant interface state: disconnected -> scanning Sep 17 16:56:47 richard-HP-EliteBook-8470p wpa_supplicant[1506]: Trying to authenticate with 00:fe:f4:75:56:50 (SSID='BTHub3-8ZRT' freq=2412 MHz) Sep 17 16:56:47 richard-HP-EliteBook-8470p wpa_supplicant[1506]: CTRL-EVENT-DISCONNECTED bssid=00:fe:f4:75:56:50 reason=2 Sep 17 16:56:47 richard-HP-EliteBook-8470p kernel: [ 291.593766] wlan0: deauthenticating from 00:fe:f4:75:56:50 by local choice (reason=2) Sep 17 16:56:47 richard-HP-EliteBook-8470p NetworkManager[998]: (wlan0): supplicant interface state: scanning -> authenticating Sep 17 16:56:47 richard-HP-EliteBook-8470p wpa_supplicant[1506]: Trying to associate with 00:fe:f4:75:56:50 (SSID='BTHub3-8ZRT' freq=2412 MHz) Sep 17 16:56:47 richard-HP-EliteBook-8470p wpa_supplicant[1506]: Association request to the driver failed Sep 17 16:56:47 richard-HP-EliteBook-8470p kernel: [ 291.595197] wlan0: authenticate with 00:fe:f4:75:56:50 (try 1) Sep 17 16:56:47 richard-HP-EliteBook-8470p kernel: [ 291.597584] wlan0: authenticated Sep 17 16:56:47 richard-HP-EliteBook-8470p kernel: [ 291.597763] wlan0: failed to insert Dummy STA entry for the AP (error -17) Sep 17 16:56:47 richard-HP-EliteBook-8470p NetworkManager[998]: (wlan0): supplicant interface state: authenticating -> associating 有谁知道问题可能是什么，以及如何解决它？
非常感谢您的帮助！
试试这个
http://www.iasptk.com/ubuntu/19593-ubuntu-1204-wifi-not-working-at-laptop-or-notebook-unblock-it
Ubuntu 12.04。 WiFi无法正常工作
检查wifi卡是否被阻塞（终端）
rfkill list wlan (for wifi)
要么
rfkill list all (for wifi and bluetooth)
UNBLOCK ：
rfkill unblock wlan (for wifi)
要么
rfkill unblock all (for wifi and bluetooth)
重启网络：
sudo service network-manager restart
实际上我按照2步在我的电脑上启用了无线function
第1步：删除bcmwl-kernel-source包
sudo apt-get remove bcmwl-kernel-source
第2步：安装firmware-b43-installer软件包。
sudo apt-get install firmware-b43-installer
然后重新启动我的电脑。
终于完成了我的工作。 🙂