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[YAFU <1436891@xxxxxxxxxxxxxxxxxx>]

Could the problem be related to kwalletmanager and password management
system? When I try to connect to wifi then KWallet insists on being
used. I select "Cancel" and the wifi network is not connected. I've
noticed that KWallet takes the control of the system. In previous
versions of Kubuntu, I could disable KWallet from systemsettings, but
now I can't find this entry. After launching KWallet from the menu and
from KWallet settings, I can disable it. But KWallet gets worse, it
continues requesting to be used, and if I try to open it from the menu,
KWallet freezes. In the end I decided to use it and set a password. The
wifi connection was established but the connection falls at few seconds.
>From LiveDVD I can not connect to wifi too, but KWallet is not open
asking to be used in LiveDVD, but I do not know, maybe kwallet is
intervening in the background too.

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https://bugs.launchpad.net/bugs/1436891

Title:
  Cannot connect to any WiFi access point which runs wireless-N

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  When attempting to connect to a WiFi access point with N wireless, two popup messages appear:
  Connection 'SSID' deactivated.
  The WiFi network could not be found

  Expected behaviour:  Connects to network.

  Minimal demonstration:  connect to a WiFi access point by both LAN and
  WiFi B/G.  Log in to access point, change it to B/G/N.  Connection is
  lost, cannot be re-established until reverted to B/G.

  Previous troubleshooting located here:
  https://www.kubuntuforums.net/showthread.php?67556-Can-t-use-wifi

  Description:    Ubuntu Vivid Vervet (development branch)
  Release:        15.04
  linux-firmware 1.143

  Can connect normally (with N) from 14.04.2 and 14.10 live CDs.  Can
  connect in 15.04 if and only if N deactivated in access point.

  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: linux-firmware 1.143
  ProcVersionSignature: Ubuntu 3.19.0-10.10-generic 3.19.2
  Uname: Linux 3.19.0-10-generic x86_64
  ApportVersion: 2.16.2-0ubuntu4
  Architecture: amd64
  CurrentDesktop: KDE
  Date: Fri Mar 27 00:14:58 2015
  Dependencies:
   
  InstallationDate: Installed on 2015-03-04 (22 days ago)
  InstallationMedia: Kubuntu 15.04 "Vivid Vervet" - Alpha amd64 (20150224.1)
  PackageArchitecture: all
  SourcePackage: linux-firmware
  UpgradeStatus: No upgrade log present (probably fresh install)

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