我之所以观看，/var/log/syslog是因为我的互联网浏览体验很糟糕。
我已经运行sudo apt-get update并sudo apt-get upgrade确保我尽可能保持最新状态。此循环从 wpa_supplicant 开始，到发送链接事件结束，大约每 20 秒发生一次。
May 30 09:04:37 osr-ubuntu-2 wpa_supplicant[1148]: wlx7cdd90841db3:
SME: Trying to authenticate with 6c:b0:ce:b4:5b:ed
(SSID='iitLpys1a0-2G' freq=2412 MHz)
May 30 09:04:37 osr-ubuntu-2 kernel: [ 2063.317494] wlx7cdd90841db3:
authenticate with 6c:b0:ce:b4:5b:ed May 30 09:04:37 osr-ubuntu-2
NetworkManager[986]: <info> [1496153077.8055] device
(wlx7cdd90841db3): supplicant interface state: scanning ->
authenticating
May 30 09:04:37 osr-ubuntu-2 wpa_supplicant[1148]: wlx7cdd90841db3:
Trying to associate with 6c:b0:ce:b4:5b:ed (SSID='iitLpys1a0-2G'
freq=2412 MHz) May 30 09:04:37 osr-ubuntu-2 kernel: [ 2063.356831]
wlx7cdd90841db3: send auth to 6c:b0:ce:b4:5b:ed (try 1/3)
May 30 09:04:37 osr-ubuntu-2 kernel: [ 2063.359926] wlx7cdd90841db3:
authenticated May 30 09:04:37 osr-ubuntu-2 kernel: [ 2063.360708]
wlx7cdd90841db3: associate with 6c:b0:ce:b4:5b:ed (try 1/3)
May 30 09:04:37 osr-ubuntu-2 NetworkManager[986]: <info>
[1496153077.8119] device (wlx7cdd90841db3): supplicant interface
state: authenticating -> associating
May 30 09:04:37 osr-ubuntu-2 kernel: [ 2063.367097] wlx7cdd90841db3:
RX AssocResp from 6c:b0:ce:b4:5b:ed (capab=0x1411 status=0 aid=4)
May 30 09:04:37 osr-ubuntu-2 vmnet-natd: RTM_NEWLINK:
name:wlx7cdd90841db3 index:3 flags:0x00011003
May 30 09:04:37 osr-ubuntu-2 vmnetBridge: RTM_NEWLINK:
name:wlx7cdd90841db3 index:3 flags:0x00011003
May 30 09:04:37 osr-ubuntu-2 wpa_supplicant[1148]: wlx7cdd90841db3:
Associated with 6c:b0:ce:b4:5b:ed
May 30 09:04:37 osr-ubuntu-2 kernel: [ 2063.375653] wlx7cdd90841db3:
associated
May 30 09:04:37 osr-ubuntu-2 NetworkManager[986]: <info>
[1496153077.8276] device (wlx7cdd90841db3): supplicant interface
state: associating -> associated
May 30 09:04:37 osr-ubuntu-2 NetworkManager[986]: <info>
[1496153077.9244] device (wlx7cdd90841db3): supplicant interface
state: associated -> 4-way handshake
May 30 09:04:37 osr-ubuntu-2 wpa_supplicant[1148]: wlx7cdd90841db3:
WPA: Key negotiation completed with 6c:b0:ce:b4:5b:ed [PTK=CCMP
GTK=CCMP]
May 30 09:04:37 osr-ubuntu-2 wpa_supplicant[1148]: wlx7cdd90841db3:
CTRL-EVENT-CONNECTED - Connection to 6c:b0:ce:b4:5b:ed completed [id=0
id_str=]
May 30 09:04:37 osr-ubuntu-2 vmnetBridge: RTM_NEWLINK:
name:wlx7cdd90841db3 index:3 flags:0x00011043
May 30 09:04:37 osr-ubuntu-2 vmnet-natd: RTM_NEWLINK:
name:wlx7cdd90841db3 index:3 flags:0x00011043
May 30 09:04:37 osr-ubuntu-2 vmnetBridge: Adding interface
wlx7cdd90841db3 index:3
May 30 09:04:37 osr-ubuntu-2 vmnetBridge: Started bridge
wlx7cdd90841db3 to virtual network 0.
May 30 09:04:37 osr-ubuntu-2 kernel: [ 2063.489695] /dev/vmnet: open
called by PID 1402 (vmnet-bridge)
May 30 09:04:37 osr-ubuntu-2 kernel: [ 2063.489707] /dev/vmnet: hub 0
does not exist, allocating memory.
May 30 09:04:37 osr-ubuntu-2 kernel: [ 2063.489726] /dev/vmnet: port
on hub 0 successfully opened
May 30 09:04:37 osr-ubuntu-2 kernel: [
2063.489736] bridge-wlx7cdd90841db3: device is wireless, enabling SMAC
May 30 09:04:37 osr-ubuntu-2 kernel: [ 2063.489739]
bridge-wlx7cdd90841db3: up
May 30 09:04:37 osr-ubuntu-2 kernel: [
2063.489743] bridge-wlx7cdd90841db3: attached
May 30 09:04:37 osr-ubuntu-2 NetworkManager[986]: <info>
[1496153077.9402] device (wlx7cdd90841db3): supplicant interface
state: 4-way handshake -> completed
May 30 09:04:38 osr-ubuntu-2 kernel: [ 2063.689907] userif-3: sent
link down event.
May 30 09:04:38 osr-ubuntu-2 kernel: [
2063.689912] userif-3: sent link up event.
答案1
重新启动路由器和 wifi，然后重新启动机器似乎已经解决了问题。