NetworkManager ignores setting "Automatically connect to this network when available"

[Vasya Pupkin]

I have two Wi-Fi networks available, one is slow and one is fast. I unchecked option "Automatically connect to this network when available" for slow network, but NetworkManager keeps connecting to slow network automatically. I have to manually disconnect and connect to fast network manually.

ProblemType: Bug
DistroRelease: Ubuntu 15.04
Package: network-manager 0.9.10.0-4ubuntu15.1
ProcVersionSignature: Ubuntu 3.19.0-26.28-generic 3.19.8-ckt4
Uname: Linux 3.19.0-26-generic x86_64
ApportVersion: 2.17.2-0ubuntu1.3
Architecture: amd64
CurrentDesktop: Unity
Date: Tue Aug 25 19:42:35 2015
EcryptfsInUse: Yes
IfupdownConfig:
 # interfaces(5) file used by ifup(8) and ifdown(8)
 auto lo
 iface lo inet loopback
InstallationDate: Installed on 2015-05-06 (110 days ago)
InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
IpRoute:
 default via 192.168.0.1 dev wlan0 proto static metric 1024
 192.168.0.0/23 dev wlan0 proto kernel scope link src 192.168.0.177
 192.168.10.0/24 via 192.168.0.2 dev wlan0 proto dhcp metric 10
NetworkManager.state:
 [main]
 NetworkingEnabled=true
 WirelessEnabled=true
 WWANEnabled=true
 WimaxEnabled=true
SourcePackage: network-manager
UpgradeStatus: No upgrade log present (probably fresh install)
nmcli-dev:
 DEVICE TYPE STATE DBUS-PATH CONNECTION CON-UUID CON-PATH
 wlan0 wifi connected /org/freedesktop/NetworkManager/Devices/1 VK_Main_5mhz 983d2cae-70de-47fe-8fcb-199ec5c0958a /org/freedesktop/NetworkManager/ActiveConnection/14
 lo loopback unmanaged /org/freedesktop/NetworkManager/Devices/0 -- -- --
nmcli-nm: Error: command ['nmcli', '-f', 'all', 'nm'] failed with exit code 2: Error: Object 'nm' is unknown, try 'nmcli help'.