[Bug 1569674] [NEW] [Kubuntu] Fail to connect to wifi after a recent update

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I installed the recent updates in the Update Manager and after rebooting I wasn't able to connect to my wifi network anymore.
It attempts to connect to the network and fails with the following error message:

Failed to update connection [network name]
connection.gateway-ping-timeout: can not set property:
value "46730064" of type 'guint' is invalid or out of range for property 'gateway-ping-timeout' of type 'guint'

I am able to use wired connection.

1. release:
Description:    Ubuntu Xenial Xerus (development branch)
Release:        16.04

2. network-manager version:
network-manager:
  Installed: 1.1.93-0ubuntu3
  Candidate: 1.1.93-0ubuntu3
  Version table:
 *** 1.1.93-0ubuntu3 500
        500 http://il.archive.ubuntu.com/ubuntu xenial/main amd64 Packages
        100 /var/lib/dpkg/status

3. I expected the machine to connect to wifi as always

4. it failed to connect with the above error message

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: network-manager 1.1.93-0ubuntu2
ProcVersionSignature: Ubuntu 4.4.0-18.34-generic 4.4.6
Uname: Linux 4.4.0-18-generic x86_64
ApportVersion: 2.20.1-0ubuntu1
Architecture: amd64
CurrentDesktop: KDE
Date: Wed Apr 13 06:37:27 2016
IfupdownConfig:
 # interfaces(5) file used by ifup(8) and ifdown(8)
 auto lo
 iface lo inet loopback
InstallationDate: Installed on 2016-04-01 (11 days ago)
InstallationMedia: Kubuntu 16.04 LTS "Xenial Xerus" - Beta amd64 (20160331)
IpRoute:
 default via 10.100.102.1 dev enp0s31f6  proto static  metric 100 
 10.100.102.0/24 dev enp0s31f6  proto kernel  scope link  src 10.100.102.5  metric 100 
 169.254.0.0/16 dev enp0s31f6  scope link  metric 1000
NetworkManager.state:
 [main]
 NetworkingEnabled=true
 WirelessEnabled=false
 WWANEnabled=false
 WimaxEnabled=true
RfKill:
 0: phy0: Wireless LAN
 	Soft blocked: yes
 	Hard blocked: no
SourcePackage: network-manager
UpgradeStatus: No upgrade log present (probably fresh install)
mtime.conffile..etc.NetworkManager.NetworkManager.conf: 2016-04-12T22:28:14.870844
nmcli-dev:
 DEVICE     TYPE      STATE        DBUS-PATH                                  CONNECTION          CON-UUID                              CON-PATH                                           
 enp0s31f6  ethernet  connected    /org/freedesktop/NetworkManager/Devices/0  Wired connection 1  d956dc0d-4de6-4f45-8869-a3703d8d0d28  /org/freedesktop/NetworkManager/ActiveConnection/1 
 wlp4s0     wifi      unavailable  /org/freedesktop/NetworkManager/Devices/2  --                  --                                    --                                                 
 lo         loopback  unmanaged    /org/freedesktop/NetworkManager/Devices/1  --                  --                                    --
nmcli-nm: Error: command ['nmcli', '-f', 'all', 'nm'] failed with exit code 2: Error: Object 'nm' is unknown, try 'nmcli help'.

** Affects: networkmanager-qt (Ubuntu)
     Importance: High
         Status: Confirmed


** Tags: amd64 apport-bug network nm11issue rls-x-incoming wifi xenial
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[Kubuntu] Fail to connect to wifi after a recent update
https://bugs.launchpad.net/bugs/1569674
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