某些网络的无线连接错误

我刚刚安装了Ubuntu 14.04 LTS ，关于无线的一切都很好，直到我上class。 14.04已识别并成功连接到我的家庭无线网络，但它无法连接到我的工作无线网络。 我能够看到我的工作无线网络但总是出现连接错误。 这是相关的syslog ：

 Apr 18 11:36:57 talha-HP NetworkManager[741]:  Activation (wlan0) starting connection 'WIFI-AIBU' Apr 18 11:36:57 talha-HP NetworkManager[741]:  (wlan0): device state change: disconnected -> prepare (reason 'none') [30 40 0] Apr 18 11:36:57 talha-HP NetworkManager[741]:  Activation (wlan0) Stage 1 of 5 (Device Prepare) scheduled... Apr 18 11:36:57 talha-HP NetworkManager[741]:  Activation (wlan0) Stage 1 of 5 (Device Prepare) started... Apr 18 11:36:57 talha-HP NetworkManager[741]:  Activation (wlan0) Stage 2 of 5 (Device Configure) scheduled... Apr 18 11:36:57 talha-HP NetworkManager[741]:  Activation (wlan0) Stage 1 of 5 (Device Prepare) complete. Apr 18 11:36:57 talha-HP NetworkManager[741]:  Activation (wlan0) Stage 2 of 5 (Device Configure) starting... Apr 18 11:36:57 talha-HP NetworkManager[741]:  (wlan0): device state change: prepare -> config (reason 'none') [40 50 0] Apr 18 11:36:57 talha-HP NetworkManager[741]:  Activation (wlan0/wireless): connection 'WIFI-AIBU' requires no security. No secrets needed. Apr 18 11:36:57 talha-HP NetworkManager[741]:  Config: added 'ssid' value 'WIFI-AIBU' Apr 18 11:36:57 talha-HP NetworkManager[741]:  Config: added 'scan_ssid' value '1' Apr 18 11:36:57 talha-HP NetworkManager[741]:  Config: added 'key_mgmt' value 'NONE' Apr 18 11:36:57 talha-HP NetworkManager[741]:  Activation (wlan0) Stage 2 of 5 (Device Configure) complete. Apr 18 11:36:57 talha-HP NetworkManager[741]:  Config: set interface ap_scan to 1 Apr 18 11:36:57 talha-HP NetworkManager[741]:  (wlan0): supplicant interface state: disconnected -> scanning Apr 18 11:36:57 talha-HP wpa_supplicant[755]: message repeated 5 times: [ wlan0: CTRL-EVENT-SCAN-STARTED ] Apr 18 11:36:58 talha-HP wpa_supplicant[755]: wlan0: Trying to associate with 3c:94:d5:3e:10:82 (SSID='WIFI-AIBU' freq=2462 MHz) Apr 18 11:36:58 talha-HP NetworkManager[741]:  (wlan0): supplicant interface state: scanning -> associating Apr 18 11:36:59 talha-HP wpa_supplicant[755]: wlan0: Associated with 3c:94:d5:3e:10:82 Apr 18 11:36:59 talha-HP wpa_supplicant[755]: wlan0: CTRL-EVENT-CONNECTED - Connection to 3c:94:d5:3e:10:82 completed [id=0 id_str=] Apr 18 11:36:59 talha-HP kernel: [ 1273.444046] cfg80211: Calling CRDA for country: TR Apr 18 11:36:59 talha-HP NetworkManager[741]:  (wlan0): supplicant interface state: associating -> completed Apr 18 11:36:59 talha-HP NetworkManager[741]:  Activation (wlan0/wireless) Stage 2 of 5 (Device Configure) successful. Connected to wireless network 'WIFI-AIBU'. Apr 18 11:36:59 talha-HP NetworkManager[741]:  Activation (wlan0) Stage 3 of 5 (IP Configure Start) scheduled. Apr 18 11:36:59 talha-HP NetworkManager[741]:  Activation (wlan0) Stage 3 of 5 (IP Configure Start) started... Apr 18 11:36:59 talha-HP NetworkManager[741]:  (wlan0): device state change: config -> ip-config (reason 'none') [50 70 0] Apr 18 11:36:59 talha-HP NetworkManager[741]:  Activation (wlan0) Beginning DHCPv4 transaction (timeout in 45 seconds) Apr 18 11:36:59 talha-HP NetworkManager[741]:  dhclient started with pid 3072 Apr 18 11:36:59 talha-HP NetworkManager[741]:  Activation (wlan0) Stage 3 of 5 (IP Configure Start) complete. Apr 18 11:36:59 talha-HP kernel: [ 1273.450186] cfg80211: Regulatory domain changed to country: TR Apr 18 11:36:59 talha-HP kernel: [ 1273.450191] cfg80211: (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp) Apr 18 11:36:59 talha-HP kernel: [ 1273.450194] cfg80211: (2402000 KHz - 2482000 KHz @ 40000 KHz), (N/A, 2000 mBm) Apr 18 11:36:59 talha-HP kernel: [ 1273.450196] cfg80211: (5170000 KHz - 5250000 KHz @ 20000 KHz), (N/A, 2000 mBm) Apr 18 11:36:59 talha-HP kernel: [ 1273.450198] cfg80211: (5250000 KHz - 5330000 KHz @ 20000 KHz), (N/A, 2000 mBm) Apr 18 11:36:59 talha-HP kernel: [ 1273.450201] cfg80211: (57240000 KHz - 65880000 KHz @ 2160000 KHz), (N/A, 4000 mBm) Apr 18 11:36:59 talha-HP avahi-daemon[722]: Withdrawing address record for fe80::6627:37ff:fe56:afb9 on wlan0. Apr 18 11:36:59 talha-HP avahi-daemon[722]: Leaving mDNS multicast group on interface wlan0.IPv6 with address fe80::6627:37ff:fe56:afb9. Apr 18 11:36:59 talha-HP avahi-daemon[722]: Interface wlan0.IPv6 no longer relevant for mDNS. Apr 18 11:36:59 talha-HP dhclient: Internet Systems Consortium DHCP Client 4.2.4 Apr 18 11:36:59 talha-HP dhclient: Copyright 2004-2012 Internet Systems Consortium. Apr 18 11:36:59 talha-HP dhclient: All rights reserved. Apr 18 11:36:59 talha-HP dhclient: For info, please visit https://www.isc.org/software/dhcp/ Apr 18 11:36:59 talha-HP dhclient: Apr 18 11:36:59 talha-HP NetworkManager[741]:  (wlan0): DHCPv4 state changed nbi -> preinit Apr 18 11:36:59 talha-HP dhclient: Listening on LPF/wlan0/64:27:37:56:af:b9 Apr 18 11:36:59 talha-HP dhclient: Sending on LPF/wlan0/64:27:37:56:af:b9 Apr 18 11:36:59 talha-HP dhclient: Sending on Socket/fallback Apr 18 11:36:59 talha-HP dhclient: DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 3 (xid=0x8c5113b) Apr 18 11:37:00 talha-HP avahi-daemon[722]: Joining mDNS multicast group on interface wlan0.IPv6 with address fe80::6627:37ff:fe56:afb9. Apr 18 11:37:00 talha-HP avahi-daemon[722]: New relevant interface wlan0.IPv6 for mDNS. Apr 18 11:37:00 talha-HP avahi-daemon[722]: Registering new address record for fe80::6627:37ff:fe56:afb9 on wlan0.*. Apr 18 11:37:02 talha-HP dhclient: DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 8 (xid=0x8c5113b) Apr 18 11:37:10 talha-HP dhclient: DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 14 (xid=0x8c5113b) Apr 18 11:37:24 talha-HP dhclient: DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 16 (xid=0x8c5113b) Apr 18 11:37:40 talha-HP dhclient: DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 18 (xid=0x8c5113b) Apr 18 11:37:44 talha-HP NetworkManager[741]:  (wlan0): DHCPv4 request timed out. Apr 18 11:37:44 talha-HP NetworkManager[741]:  (wlan0): canceled DHCP transaction, DHCP client pid 3072 Apr 18 11:37:44 talha-HP NetworkManager[741]:  Activation (wlan0) Stage 4 of 5 (IPv4 Configure Timeout) scheduled... Apr 18 11:37:44 talha-HP NetworkManager[741]:  Activation (wlan0) Stage 4 of 5 (IPv4 Configure Timeout) started... Apr 18 11:37:44 talha-HP NetworkManager[741]:  (wlan0): device state change: ip-config -> failed (reason 'ip-config-unavailable') [70 120 5] Apr 18 11:37:44 talha-HP NetworkManager[741]:  Marking connection 'WIFI-AIBU' invalid. Apr 18 11:37:44 talha-HP NetworkManager[741]:  Activation (wlan0) failed for connection 'WIFI-AIBU' Apr 18 11:37:44 talha-HP NetworkManager[741]:  Activation (wlan0) Stage 4 of 5 (IPv4 Configure Timeout) complete. Apr 18 11:37:44 talha-HP NetworkManager[741]:  (wlan0): device state change: failed -> disconnected (reason 'none') [120 30 0] Apr 18 11:37:44 talha-HP NetworkManager[741]:  (wlan0): deactivating device (reason 'none') [0] Apr 18 11:37:44 talha-HP avahi-daemon[722]: Withdrawing address record for fe80::6627:37ff:fe56:afb9 on wlan0. Apr 18 11:37:44 talha-HP avahi-daemon[722]: Leaving mDNS multicast group on interface wlan0.IPv6 with address fe80::6627:37ff:fe56:afb9. Apr 18 11:37:44 talha-HP avahi-daemon[722]: Interface wlan0.IPv6 no longer relevant for mDNS. Apr 18 11:37:44 talha-HP wpa_supplicant[755]: wlan0: CTRL-EVENT-DISCONNECTED bssid=3c:94:d5:3e:10:82 reason=3 locally_generated=1 Apr 18 11:37:44 talha-HP wpa_supplicant[755]: nl80211: Was expecting local disconnect but got another disconnect event first 

ps其他信息

• 它也成功连接到我的手机的WiFi。
• 我昨天能够使用Ubuntu 12.04连接同一网络 。

编辑：输出lspci -nnk | grep -iA2 net

 02:00.0 Network controller [0280]: Broadcom Corporation BCM4313 802.11bgn Wireless Network Adapter [14e4:4727] (rev 01) Subsystem: Hewlett-Packard Company Device [103c:1795] Kernel driver in use: wl 03:00.0 Ethernet controller [0200]: Realtek Semiconductor Co., Ltd. RTL8101E/RTL8102E PCI Express Fast Ethernet controller [10ec:8136] (rev 05) Subsystem: Hewlett-Packard Company Device [103c:1670] Kernel driver in use: r8169