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[goliy <1332904@xxxxxxxxxxxxxxxxxx>]

It happens not very often with me, usually when I reboot Access Point and Ubuntu just don't want to find AP again. When I turn off and turn on wifi - no networks at all.
Whank you for temp solution: "sudo iwlist scan" works much better then reboot =)

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https://bugs.launchpad.net/bugs/1332904

Title:
  Network manager stopped scanning for wifi networks

Status in network-manager package in Ubuntu:
  New

Bug description:
  After I resumed my laptop from suspend, it would not connect to wifi.
  For a while, it seemed confused about its connection state, then it
  displayed "disconnected", and showed that there were no wifi networks
  available (which is not true).

  To debug the problem, I ran "nmcli d wifi list", which showed no results.
  Then I ran "iwlist scan", which also showed no results.
  Then I tried "sudo iwlist scan" - which showed all the wifi networks, and actually caused the network manager to start working again. It connected to a network successfully, and so on.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: network-manager 0.9.8.8-0ubuntu7
  ProcVersionSignature: Ubuntu 3.13.0-30.54-generic 3.13.11.2
  Uname: Linux 3.13.0-30-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.2
  Architecture: amd64
  CurrentDesktop: KDE
  Date: Sat Jun 21 22:12:35 2014
  EcryptfsInUse: Yes
  IfupdownConfig:
   # interfaces(5) file used by ifup(8) and ifdown(8)
   auto lo
   iface lo inet loopback
  InstallationDate: Installed on 2013-04-05 (443 days ago)
  InstallationMedia: Kubuntu 12.10 "Quantal Quetzal" - Release amd64 (20121017.1)
  IpRoute:
   default via 192.168.1.1 dev wlan0  proto static 
   192.168.1.0/24 dev wlan0  proto kernel  scope link  src 192.168.1.34  metric 9
  SourcePackage: network-manager
  UpgradeStatus: Upgraded to trusty on 2014-05-14 (39 days ago)
  nmcli-dev:
   DEVICE     TYPE              STATE         DBUS-PATH                                  
   wlan0      802-11-wireless   connected     /org/freedesktop/NetworkManager/Devices/0
  nmcli-nm:
   RUNNING         VERSION    STATE           NET-ENABLED   WIFI-HARDWARE   WIFI       WWAN-HARDWARE   WWAN      
   running         0.9.8.8    connected       enabled       enabled         enabled    enabled         disabled

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