Comment 0 for bug 1436891

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)