我是 ubuntu 新手，2 天前安装了 14.04LTS 版本，但是我遇到了 wifi 问题！当我打开笔记本电脑并开始使用时，一切正常，连接也很好，但过了很长时间，大约 5 分钟后我就断网了，一切看起来都很好，没有断开连接错误或任何迹象，只是断网了，我无法打开任何网站或执行任何操作，就像断开连接一样，我试图断开连接并重新连接，但当我这样做时，它再也无法连接“断开连接，您处于离线状态”，我所能做的就是使用有线连接或重新启动笔记本电脑来连接到互联网 :/ 我真的很累，开始后悔安装 ubuntu 了，我在这个网站或其他网站上尝试了很多关于终端命令行的方法，但情况仍然一样，所以请有人帮帮我！
这是我的 wifi 信息：
########## wireless info START ##########
Report from: 27 Feb 2016 10:33 EET +0200
Booted last: 27 Feb 2016 09:00 EET +0200
Script from: 27 Sep 2015 00:34 UTC +0000
##### release ###########################
Distributor ID: Ubuntu
Description: Ubuntu 14.04.4 LTS
Release: 14.04
Codename: trusty
##### kernel ############################
Linux 4.2.0-30-generic #35~14.04.1-Ubuntu SMP Fri Feb 19 14:48:13 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux
Parameters: ro, quiet, splash, vt.handoff=7
##### desktop ###########################
Ubuntu
##### lspci #############################
01:00.0 Ethernet controller [0200]: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller [10ec:8168] (rev 10)
Subsystem: Lenovo Device [17aa:380b]
Kernel driver in use: r8169
02:00.0 Network controller [0280]: Realtek Semiconductor Co., Ltd. RTL8723BE PCIe Wireless Network Adapter [10ec:b723]
Subsystem: Lenovo Device [17aa:b736]
Kernel driver in use: rtl8723be
##### lsusb #############################
Bus 003 Device 002: ID 8087:8000 Intel Corp.
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 006: ID 0bda:b728 Realtek Semiconductor Corp.
Bus 001 Device 005: ID 174f:14b2 Syntek
Bus 001 Device 004: ID 0bda:0129 Realtek Semiconductor Corp. RTS5129 Card Reader Controller
Bus 001 Device 012: ID 046d:c016 Logitech, Inc. Optical Wheel Mouse
Bus 001 Device 009: ID 04e8:6864 Samsung Electronics Co., Ltd
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
##### PCMCIA card info ##################
##### rfkill ############################
0: ideapad_wlan: Wireless LAN
Soft blocked: no
Hard blocked: no
1: ideapad_bluetooth: Bluetooth
Soft blocked: yes
Hard blocked: no
2: hci0: Bluetooth
Soft blocked: yes
Hard blocked: no
3: phy0: Wireless LAN
Soft blocked: no
Hard blocked: no
##### lsmod #############################
rndis_wlan 57344 0
rndis_host 16384 1 rndis_wlan
usbnet 40960 3 rndis_host,rndis_wlan,cdc_ether
rtl8723be 90112 0
btcoexist 53248 1 rtl8723be
rtl8723_common 24576 1 rtl8723be
rtl_pci 28672 1 rtl8723be
rtlwifi 77824 2 rtl_pci,rtl8723be
mac80211 729088 3 rtl_pci,rtlwifi,rtl8723be
cfg80211 540672 3 mac80211,rndis_wlan,rtlwifi
mxm_wmi 16384 1 nouveau
snd_soc_rt5640 114688 0
snd_soc_rl6231 16384 1 snd_soc_rt5640
snd_soc_core 200704 1 snd_soc_rt5640
ideapad_laptop 24576 0
sparse_keymap 16384 1 ideapad_laptop
snd_pcm 102400 8 snd_soc_rt5640,snd_soc_core,snd_hda_codec_hdmi,snd_hda_codec,snd_hda_intel,snd_pcm_dmaengine,snd_hda_core
video 40960 3 i915,ideapad_laptop,nouveau
wmi 20480 2 mxm_wmi,nouveau
##### interfaces ########################
auto lo
iface lo inet loopback
##### ifconfig ##########################
eth0 Link encap:Ethernet HWaddr <MAC 'eth0' [IF]>
UP BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
usb0 Link encap:Ethernet HWaddr <MAC 'usb0' [IF]>
inet addr:192.168.42.132 Bcast:192.168.42.255 Mask:255.255.255.0
inet6 addr: fe80::<IP6 'usb0' [IF]>/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:86095 errors:7 dropped:0 overruns:0 frame:7
TX packets:72237 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:83388892 (83.3 MB) TX bytes:11985551 (11.9 MB)
wlan0 Link encap:Ethernet HWaddr <MAC 'wlan0' [IF]>
UP BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:9909 errors:0 dropped:0 overruns:0 frame:0
TX packets:7625 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:11767106 (11.7 MB) TX bytes:1353364 (1.3 MB)
##### iwconfig ##########################
eth0 no wireless extensions.
usb0 no wireless extensions.
lo no wireless extensions.
wlan0 IEEE 802.11bgn ESSID:off/any
Mode:Managed Access Point: Not-Associated Tx-Power=20 dBm
Retry short limit:7 RTS thr=2347 B Fragment thr:off
Power Management:off
##### route #############################
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
0.0.0.0 192.168.42.129 0.0.0.0 UG 0 0 0 usb0
192.168.42.0 0.0.0.0 255.255.255.0 U 1 0 0 usb0
##### resolv.conf #######################
nameserver 127.0.1.1
##### network managers ##################
Installed:
NetworkManager
Running:
root 838 1 0 09:00 ? 00:00:01 NetworkManager
##### NetworkManager info ###############
NetworkManager Tool
State: connected (global)
- Device: usb0 [Wired connection 2] -------------------------------------------
Type: Wired
Driver: rndis_host
State: connected
Default: yes
HW Address: <MAC 'usb0' [IF]>
Capabilities:
Carrier Detect: yes
Wired Properties
Carrier: on
IPv4 Settings:
Address: 192.168.42.132
Prefix: 24 (255.255.255.0)
Gateway: 192.168.42.129
DNS: 192.168.42.129
- Device: wlan0 ----------------------------------------------------------------
Type: 802.11 WiFi
Driver: rtl8723be
State: disconnected
Default: no
HW Address: <MAC 'wlan0' [IF]>
Capabilities:
Wireless Properties
WEP Encryption: yes
WPA Encryption: yes
WPA2 Encryption: yes
Wireless Access Points
- Device: eth0 -----------------------------------------------------------------
Type: Wired
Driver: r8169
State: unavailable
Default: no
HW Address: <MAC 'eth0' [IF]>
Capabilities:
Carrier Detect: yes
Wired Properties
Carrier: off
##### NetworkManager.state ##############
[main]
NetworkingEnabled=true
WirelessEnabled=true
WWANEnabled=true
WimaxEnabled=true
##### NetworkManager.conf ###############
[main]
plugins=ifupdown,keyfile,ofono
dns=dnsmasq
no-auto-default=<MAC 'eth0' [IF]>,
[ifupdown]
managed=false
##### NetworkManager profiles ###########
Sorry, try again.
[[/etc/NetworkManager/system-connections/ro_ma]] (600 root)
[connection] id=ro_ma | type=802-11-wireless
[802-11-wireless] ssid=ro_ma | mac-address=<MAC 'wlan0' [IF]>
[ipv4] method=auto
[ipv6] method=auto
[[/etc/NetworkManager/system-connections/HUAWEI-97d6]] (600 root)
[connection] id=HUAWEI-97d6 | type=802-11-wireless
[802-11-wireless] ssid=HUAWEI-97d6 | mac-address=<MAC 'wlan0' [IF]>
[ipv4] method=auto
[ipv6] method=auto
[[/etc/NetworkManager/system-connections/ppmu]] (600 root)
[connection] id=ppmu | type=802-11-wireless
[802-11-wireless] ssid=ppmu | mac-address=<MAC 'wlan0' [IF]>
[ipv4] method=auto
[ipv6] method=auto
##### iw reg get ########################
Region: Africa/Cairo (based on set time zone)
country 00:
(2402 - 2472 @ 40), (3, 20)
(2457 - 2482 @ 40), (3, 20), PASSIVE-SCAN, NO-IBSS
(2474 - 2494 @ 20), (3, 20), NO-OFDM, PASSIVE-SCAN, NO-IBSS
(5170 - 5250 @ 40), (3, 20), PASSIVE-SCAN, NO-IBSS
(5735 - 5835 @ 40), (3, 20), PASSIVE-SCAN, NO-IBSS
##### iwlist channels ###################
eth0 no frequency information.
usb0 no frequency information.
lo no frequency information.
wlan0 13 channels in total; available frequencies :
Channel 01 : 2.412 GHz
Channel 02 : 2.417 GHz
Channel 03 : 2.422 GHz
Channel 04 : 2.427 GHz
Channel 05 : 2.432 GHz
Channel 06 : 2.437 GHz
Channel 07 : 2.442 GHz
Channel 08 : 2.447 GHz
Channel 09 : 2.452 GHz
Channel 10 : 2.457 GHz
Channel 11 : 2.462 GHz
Channel 12 : 2.467 GHz
Channel 13 : 2.472 GHz
##### iwlist scan #######################
eth0 Interface doesn't support scanning.
usb0 Interface doesn't support scanning.
lo Interface doesn't support scanning.
Channel occupancy:
1 APs on Frequency:2.417 GHz (Channel 2)
1 APs on Frequency:2.427 GHz (Channel 4)
1 APs on Frequency:2.462 GHz (Channel 11)
wlan0 Scan completed :
Cell 01 - Address: <MAC 'mayar saad' [AC1]>
Channel:2
Frequency:2.417 GHz (Channel 2)
Quality=34/70 Signal level=-76 dBm
Encryption key:on
ESSID:"mayar saad"
Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 6 Mb/s
9 Mb/s; 12 Mb/s; 18 Mb/s
Bit Rates:24 Mb/s; 36 Mb/s; 48 Mb/s; 54 Mb/s
Mode:Master
Extra:tsf=0000000a8684e17e
Extra: Last beacon: 812ms ago
IE: WPA Version 1
Group Cipher : TKIP
Pairwise Ciphers (2) : TKIP CCMP
Authentication Suites (1) : PSK
IE: IEEE 802.11i/WPA2 Version 1
Group Cipher : TKIP
Pairwise Ciphers (2) : TKIP CCMP
Authentication Suites (1) : PSK
Cell 02 - Address: <MAC 'ppmu' [AC2]>
Channel:11
Frequency:2.462 GHz (Channel 11)
Quality=70/70 Signal level=-34 dBm
Encryption key:on
ESSID:"ppmu"
Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 9 Mb/s
18 Mb/s; 36 Mb/s; 54 Mb/s
Bit Rates:6 Mb/s; 12 Mb/s; 24 Mb/s; 48 Mb/s
Mode:Master
Extra:tsf=000000036dec7157
Extra: Last beacon: 172ms ago
IE: WPA Version 1
Group Cipher : TKIP
Pairwise Ciphers (1) : TKIP
Authentication Suites (1) : PSK
Cell 03 - Address: <MAC 'ro_ma' [AC3]>
Channel:4
Frequency:2.427 GHz (Channel 4)
Quality=36/70 Signal level=-74 dBm
Encryption key:on
ESSID:"ro_ma"
Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 9 Mb/s
18 Mb/s; 36 Mb/s; 54 Mb/s
Bit Rates:6 Mb/s; 12 Mb/s; 24 Mb/s; 48 Mb/s
Mode:Master
Extra:tsf=0000000db6c2b15b
Extra: Last beacon: 1508ms ago
IE: WPA Version 1
Group Cipher : TKIP
Pairwise Ciphers (2) : TKIP CCMP
Authentication Suites (1) : PSK
##### module infos ######################
[rtl8723be]
filename: /lib/modules/4.2.0-30-generic/kernel/drivers/net/wireless/rtlwifi/rtl8723be/rtl8723be.ko
firmware: rtlwifi/rtl8723befw.bin
description: Realtek 8723BE 802.11n PCI wireless
license: GPL
author: Realtek WlanFAE <[email protected]>
author: PageHe <[email protected]>
srcversion: 0EB6BE33DFAD6AEFD4D63AE
depends: rtlwifi,rtl8723-common,rtl_pci,btcoexist,mac80211
intree: Y
vermagic: 4.2.0-30-generic SMP mod_unload modversions
signer: Build time autogenerated kernel key
sig_key: A5:12:3B:D7:BC:9F:40:9E:55:8B:C8:E5:DE:0B:BB:59:AA:18:40:1F
sig_hashalgo: sha512
parm: swenc:Set to 1 for software crypto (default 0)
(bool)
parm: ips:Set to 0 to not use link power save (default 1)
(bool)
parm: swlps:Set to 1 to use SW control power save (default 0)
(bool)
parm: fwlps:Set to 1 to use FW control power save (default 1)
(bool)
parm: msi:Set to 1 to use MSI interrupts mode (default 0)
(bool)
parm: debug:Set debug level (0-5) (default 0) (int)
parm: disable_watchdog:Set to 1 to disable the watchdog (default 0)
(bool)
[rtl8723_common]
filename: /lib/modules/4.2.0-30-generic/kernel/drivers/net/wireless/rtlwifi/rtl8723com/rtl8723-common.ko
description: Realtek RTL8723AE/RTL8723BE 802.11n PCI wireless common routines
license: GPL
author: Larry Finger <[email protected]>
author: Realtek WlanFAE <[email protected]>
srcversion: 251C540A2D3AD38CCA85ED9
depends:
intree: Y
vermagic: 4.2.0-30-generic SMP mod_unload modversions
signer: Build time autogenerated kernel key
sig_key: A5:12:3B:D7:BC:9F:40:9E:55:8B:C8:E5:DE:0B:BB:59:AA:18:40:1F
sig_hashalgo: sha512
[rtl_pci]
filename: /lib/modules/4.2.0-30-generic/kernel/drivers/net/wireless/rtlwifi/rtl_pci.ko
description: PCI basic driver for rtlwifi
license: GPL
author: Larry Finger <[email protected]>
author: Realtek WlanFAE <[email protected]>
author: lizhaoming <[email protected]>
srcversion: 2E1C688267DE11E1F26A728
depends: mac80211,rtlwifi
intree: Y
vermagic: 4.2.0-30-generic SMP mod_unload modversions
signer: Build time autogenerated kernel key
sig_key: A5:12:3B:D7:BC:9F:40:9E:55:8B:C8:E5:DE:0B:BB:59:AA:18:40:1F
sig_hashalgo: sha512
[rtlwifi]
filename: /lib/modules/4.2.0-30-generic/kernel/drivers/net/wireless/rtlwifi/rtlwifi.ko
description: Realtek 802.11n PCI wireless core
license: GPL
author: Larry Finger <[email protected]>
author: Realtek WlanFAE <[email protected]>
author: lizhaoming <[email protected]>
srcversion: F4CACC5FCAEBE7C22930A24
depends: mac80211,cfg80211
intree: Y
vermagic: 4.2.0-30-generic SMP mod_unload modversions
signer: Build time autogenerated kernel key
sig_key: A5:12:3B:D7:BC:9F:40:9E:55:8B:C8:E5:DE:0B:BB:59:AA:18:40:1F
sig_hashalgo: sha512
[mac80211]
filename: /lib/modules/4.2.0-30-generic/kernel/net/mac80211/mac80211.ko
license: GPL
description: IEEE 802.11 subsystem
srcversion: 292BCC26A10EA884DF6B5FF
depends: cfg80211
intree: Y
vermagic: 4.2.0-30-generic SMP mod_unload modversions
signer: Build time autogenerated kernel key
sig_key: A5:12:3B:D7:BC:9F:40:9E:55:8B:C8:E5:DE:0B:BB:59:AA:18:40:1F
sig_hashalgo: sha512
parm: minstrel_vht_only:Use only VHT rates when VHT is supported by sta. (bool)
parm: max_nullfunc_tries:Maximum nullfunc tx tries before disconnecting (reason 4). (int)
parm: max_probe_tries:Maximum probe tries before disconnecting (reason 4). (int)
parm: beacon_loss_count:Number of beacon intervals before we decide beacon was lost. (int)
parm: probe_wait_ms:Maximum time(ms) to wait for probe response before disconnecting (reason 4). (int)
parm: ieee80211_default_rc_algo:Default rate control algorithm for mac80211 to use (charp)
[cfg80211]
filename: /lib/modules/4.2.0-30-generic/kernel/net/wireless/cfg80211.ko
description: wireless configuration support
license: GPL
author: Johannes Berg
srcversion: 7982686FBE8064A87E02753
depends:
intree: Y
vermagic: 4.2.0-30-generic SMP mod_unload modversions
signer: Build time autogenerated kernel key
sig_key: A5:12:3B:D7:BC:9F:40:9E:55:8B:C8:E5:DE:0B:BB:59:AA:18:40:1F
sig_hashalgo: sha512
parm: ieee80211_regdom:IEEE 802.11 regulatory domain code (charp)
parm: cfg80211_disable_40mhz_24ghz:Disable 40MHz support in the 2.4GHz band (bool)
##### module parameters #################
[rtl8723be]
debug: 0
disable_watchdog: N
fwlps: Y
ips: Y
msi: N
swenc: N
swlps: N
[mac80211]
beacon_loss_count: 7
ieee80211_default_rc_algo: minstrel_ht
max_nullfunc_tries: 2
max_probe_tries: 5
minstrel_vht_only: Y
probe_wait_ms: 500
[cfg80211]
cfg80211_disable_40mhz_24ghz: N
ieee80211_regdom: 00
##### /etc/modules ######################
lp
rtc
##### modprobe options ##################
[/etc/modprobe.d/blacklist-ath_pci.conf]
blacklist ath_pci
[/etc/modprobe.d/blacklist.conf]
blacklist evbug
blacklist usbmouse
blacklist usbkbd
blacklist eepro100
blacklist de4x5
blacklist eth1394
blacklist snd_intel8x0m
blacklist snd_aw2
blacklist i2c_i801
blacklist prism54
blacklist bcm43xx
blacklist garmin_gps
blacklist asus_acpi
blacklist snd_pcsp
blacklist pcspkr
blacklist amd76x_edac
[/etc/modprobe.d/blacklist-rare-network.conf]
alias net-pf-3 off
alias net-pf-6 off
alias net-pf-9 off
alias net-pf-11 off
alias net-pf-12 off
alias net-pf-19 off
alias net-pf-21 off
alias net-pf-36 off
[/etc/modprobe.d/iwlwifi.conf]
remove iwlwifi \
(/sbin/lsmod | grep -o -e ^iwlmvm -e ^iwldvm -e ^iwlwifi | xargs /sbin/rmmod) \
&& /sbin/modprobe -r mac80211
[/etc/modprobe.d/mlx4.conf]
softdep mlx4_core post: mlx4_en
[/etc/modprobe.d/rtl8723be.conf]
options rtl8723be fwl=0
##### rc.local ##########################
exit 0
##### pm-utils ##########################
##### udev rules ########################
[/etc/udev/rules.d/70-persistent-net.rules]
# PCI device 0x10ec:0x8168 (r8169)
SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="<MAC 'eth0' [IF]>", ATTR{dev_id}=="0x0", ATTR{type}=="1", KERNEL=="eth*", NAME="eth0"
# PCI device 0x10ec:0xb723 (rtl8723be)
SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="<MAC 'wlan0' [IF]>", ATTR{dev_id}=="0x0", ATTR{type}=="1", KERNEL=="wlan*", NAME="wlan0"
# USB device 0x:0x (cdc_ether)
SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="<MAC address>", ATTR{dev_id}=="0x0", ATTR{type}=="1", KERNEL=="eth*", NAME="eth1"
##### dmesg #############################
[ 3572.727341] usb 1-3: device firmware changed
[ 5568.365431] wlan0: authenticate with <MAC 'ppmu' [AC2]>
[ 5568.388846] wlan0: direct probe to <MAC 'ppmu' [AC2]> (try 1/3)
########## wireless info END ############