Connecting to Wi-Fi network stuck at obtaining address

[karaluh]

When I try to connect to my home network, the connection becomes stuck at obtaining address. I dualboot and the connection works fine on Windows.

ProblemType: Bug
DistroRelease: Ubuntu 15.04
Package: network-manager 0.9.10.0-4ubuntu15.2
ProcVersionSignature: Ubuntu 3.19.0-22.22-generic 3.19.8-ckt1
Uname: Linux 3.19.0-22-generic i686
NonfreeKernelModules: nvidia
ApportVersion: 2.17.2-0ubuntu1.1
Architecture: i386
CurrentDesktop: KDE
Date: Wed Jul 8 21:24:44 2015
IfupdownConfig:
 auto lo
 iface lo inet loopback
InstallationDate: Installed on 2012-05-12 (1152 days ago)
InstallationMedia: Kubuntu 12.04 LTS "Precise Pangolin" - Release i386 (20120423)
IpRoute:
 default via 192.168.0.1 dev eth0 proto static metric 100
 169.254.0.0/16 dev eth0 scope link metric 1000
 192.168.0.0/24 dev eth0 proto kernel scope link src 192.168.0.2
 192.168.122.0/24 dev virbr0 proto kernel scope link src 192.168.122.1
NetworkManager.state:
 [main]
 NetworkingEnabled=true
 WirelessEnabled=true
 WWANEnabled=true
 WimaxEnabled=true
SourcePackage: network-manager
UpgradeStatus: Upgraded to vivid on 2015-04-23 (75 days ago)
mtime.conffile..etc.NetworkManager.NetworkManager.conf: 2014-03-08T14:45:48.205794
nmcli-con:
 NAME UUID TYPE TIMESTAMP TIMESTAMP-REAL AUTOCONNECT READONLY DBUS-PATH ACTIVE DEVICE STATE ACTIVE-PATH
 karaluh a7555e49-d710-4151-8749-28cbaf6146a8 802-11-wireless 1436303693 wto, 7 lip 2015, 23:14:53 yes no /org/freedesktop/NetworkManager/Settings/1 yes wlan0 activating /org/freedesktop/NetworkManager/ActiveConnection/0
 Połączenie przewodowe 1 f3a15bb7-5ba6-4d61-ae24-345593df7986 802-3-ethernet 1436383330 śro, 8 lip 2015, 21:22:10 yes no /org/freedesktop/NetworkManager/Settings/0 yes eth0 activated /org/freedesktop/NetworkManager/ActiveConnection/1
nmcli-nm: Error: command ['nmcli', '-f', 'all', 'nm'] failed with exit code 2: Error: Object 'nm' is unknown, try 'nmcli help'.