刚才网络忽然中断又自动连上，但是上不了网，重新关下网络再开又可以了。
连忙去系统日志里看了下，抓取日志如下（不包括重手动开关网络的日志）：

[    5.402262] systemd-udevd[506]: starting version 204
[    5.446830] lp: driver loaded but no devices found
[    5.472801] ppdev: user-space parallel port driver
[    5.501498] mei_me 0000:00:16.0: irq 60 for MSI/MSI-X
[    5.551752] Bluetooth: Core ver 2.17
[    5.551769] NET: Registered protocol family 31
[    5.551771] Bluetooth: HCI device and connection manager initialized
[    5.551777] Bluetooth: HCI socket layer initialized
[    5.551779] Bluetooth: L2CAP socket layer initialized
[    5.551782] Bluetooth: SCO socket layer initialized
[    5.555299] ACPI Warning: 0x0000000000001828-0x000000000000182f SystemIO conflicts with Region \PMIO 1 (20131115/utaddress-251)
[    5.555306] ACPI: If an ACPI driver is available for this device, you should use it instead of the native driver
[    5.555309] ACPI Warning: 0x0000000000000830-0x000000000000083f SystemIO conflicts with Region \GPRL 1 (20131115/utaddress-251)
[    5.555312] ACPI Warning: 0x0000000000000830-0x000000000000083f SystemIO conflicts with Region \GPR_ 2 (20131115/utaddress-251)
[    5.555316] ACPI: If an ACPI driver is available for this device, you should use it instead of the native driver
[    5.555317] ACPI Warning: 0x0000000000000800-0x000000000000082f SystemIO conflicts with Region \GPRL 1 (20131115/utaddress-251)
[    5.555320] ACPI Warning: 0x0000000000000800-0x000000000000082f SystemIO conflicts with Region \GPR_ 2 (20131115/utaddress-251)
[    5.555322] ACPI Warning: 0x0000000000000800-0x000000000000082f SystemIO conflicts with Region \IO_D 3 (20131115/utaddress-251)
[    5.555325] ACPI: If an ACPI driver is available for this device, you should use it instead of the native driver
[    5.555326] lpc_ich: Resource conflict(s) found affecting gpio_ich
[    5.557744] Bluetooth: BNEP (Ethernet Emulation) ver 1.3
[    5.557747] Bluetooth: BNEP filters: protocol multicast
[    5.557755] Bluetooth: BNEP socket layer initialized
[    5.559522] HDA driver get symbol successfully from i915 module
[    5.559785] snd_hda_intel 0000:00:1b.0: irq 61 for MSI/MSI-X
[    5.566854] snd_hda_intel 0000:00:03.0: irq 62 for MSI/MSI-X
[    5.569956] systemd-hostnamed[622]: Warning: nss-myhostname is not installed. Changing the local hostname might make it unresolveable. Please install nss-myhostname!
[    5.575034] cfg80211: Calling CRDA to update world regulatory domain
[    5.582963] Intel(R) Wireless WiFi driver for Linux, in-tree:
[    5.582966] Copyright(c) 2003-2013 Intel Corporation
[    5.583141] iwlwifi 0000:01:00.0: irq 63 for MSI/MSI-X
[    5.584598] lib80211: common routines for IEEE802.11 drivers
[    5.584601] lib80211_crypt: registered algorithm 'NULL'
[    5.585793] wl: module license 'MIXED/Proprietary' taints kernel.
[    5.585797] Disabling lock debugging due to kernel taint
[    5.587355] wl: module verification failed: signature and/or  required key missing - tainting kernel
[    5.590426] iwlwifi 0000:01:00.0: loaded firmware version 22.24.8.0 op_mode iwlmvm
[    5.596050] init: flush-early-job-log main process (566) terminated with status 1
[    5.606156] input: HDA Intel HDMI HDMI/DP,pcm=8 as /devices/pci0000:00/0000:00:03.0/sound/card0/input11
[    5.606226] input: HDA Intel HDMI HDMI/DP,pcm=7 as /devices/pci0000:00/0000:00:03.0/sound/card0/input10
[    5.606284] input: HDA Intel HDMI HDMI/DP,pcm=3 as /devices/pci0000:00/0000:00:03.0/sound/card0/input9
[    5.609925] iwlwifi 0000:01:00.0: Detected Intel(R) Wireless N 7260, REV=0x144
[    5.609991] iwlwifi 0000:01:00.0: L1 Disabled; Enabling L0S
[    5.610232] iwlwifi 0000:01:00.0: L1 Disabled; Enabling L0S
[    5.627004] SKU: Nid=0x1d sku_cfg=0x40f7992d
[    5.627007] SKU: port_connectivity=0x1
[    5.627008] SKU: enable_pcbeep=0x1
[    5.627010] SKU: check_sum=0x00000007
[    5.627011] SKU: customization=0x00000099
[    5.627012] SKU: external_amp=0x5
[    5.627013] SKU: platform_type=0x1
[    5.627014] SKU: swap=0x0
[    5.627015] SKU: override=0x1
[    5.627229] autoconfig: line_outs=1 (0x14/0x0/0x0/0x0/0x0) type:speaker
[    5.627230]    speaker_outs=0 (0x0/0x0/0x0/0x0/0x0)
[    5.627232]    hp_outs=1 (0x21/0x0/0x0/0x0/0x0)
[    5.627233]    mono: mono_out=0x0
[    5.627234]    inputs:
[    5.627236]      Mic=0x19
[    5.627237]      Internal Mic=0x12
[    5.627238] realtek: No valid SSID, checking pincfg 0x40f7992d for NID 0x1d
[    5.627240] realtek: Enabling init ASM_ID=0x992d CODEC_ID=10ec0283
[    5.635719] input: HDA Intel PCH Headphone as /devices/pci0000:00/0000:00:1b.0/sound/card1/input13
[    5.635794] input: HDA Intel PCH Mic as /devices/pci0000:00/0000:00:1b.0/sound/card1/input12
[    5.659828] device-mapper: multipath: version 1.6.0 loaded
[    5.828213] ieee80211 phy0: Selected rate control algorithm 'iwl-mvm-rs'
[    5.890926] cfg80211: World regulatory domain updated:
[    5.890930] cfg80211:   (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp)
[    5.890932] cfg80211:   (2402000 KHz - 2472000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)
[    5.890933] cfg80211:   (2457000 KHz - 2482000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)
[    5.890935] cfg80211:   (2474000 KHz - 2494000 KHz @ 20000 KHz), (300 mBi, 2000 mBm)
[    5.890936] cfg80211:   (5170000 KHz - 5250000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)
[    5.890937] cfg80211:   (5735000 KHz - 5835000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)
[    5.931877] init: failsafe main process (758) killed by TERM signal
[    5.960318] intel_rapl: domain uncore energy ctr 20559:20559 not working, skip
[    5.973157] init: samba-ad-dc main process (815) terminated with status 1
[    6.079159] iwlwifi 0000:01:00.0: L1 Disabled; Enabling L0S
[    6.079445] iwlwifi 0000:01:00.0: L1 Disabled; Enabling L0S
[    6.090374] IPv6: ADDRCONF(NETDEV_UP): wlan0: link is not ready
[    6.090654] IPv6: ADDRCONF(NETDEV_UP): wlan0: link is not ready
[    6.117388] init: dde-account main process (929) terminated with status 2