It happens on both home and office Lenovo X230T HP ProBook G640 The issue is not like mine. At my case 'systemctl restart network- manager' does the job.
-- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to network-manager in Ubuntu. https://bugs.launchpad.net/bugs/1632418 Title: Network Manager doesn't look for wifi after resume until restarted Status in network-manager package in Ubuntu: Confirmed Bug description: Once upon the time Network Manager doesn't scan to connect the networks until restarted ProblemType: Bug DistroRelease: Ubuntu 16.04 Package: network-manager 1.2.2-0ubuntu0.16.04.1 Uname: Linux 4.8.0-040800rc8-generic x86_64 ApportVersion: 2.20.1-0ubuntu2.1 Architecture: amd64 CurrentDesktop: Unity Date: Tue Oct 11 08:12:47 2016 IfupdownConfig: # interfaces(5) file used by ifup(8) and ifdown(8) auto lo iface lo inet loopback InstallationDate: Installed on 2015-05-20 (509 days ago) InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422) IpRoute: default via 192.168.32.254 dev wlp3s0 proto static metric 600 192.168.32.0/24 dev wlp3s0 proto kernel scope link src 192.168.32.245 metric 600 NetworkManager.state: [main] NetworkingEnabled=true WirelessEnabled=true WWANEnabled=true WimaxEnabled=true SourcePackage: network-manager UpgradeStatus: Upgraded to xenial on 2016-04-23 (170 days ago) modified.conffile..etc.NetworkManager.dispatcher.d.01ifupdown: [deleted] mtime.conffile..etc.NetworkManager.NetworkManager.conf: 2016-04-03T14:41:30.662323 nmcli-dev: DEVICE TYPE STATE DBUS-PATH CONNECTION CON-UUID CON-PATH wlp3s0 wifi connected /org/freedesktop/NetworkManager/Devices/1 ~\_/~ a9c0eb9d-4df3-4769-95a6-b910d563d526 /org/freedesktop/NetworkManager/ActiveConnection/0 enp0s25 ethernet unavailable /org/freedesktop/NetworkManager/Devices/2 -- -- -- lo loopback unmanaged /org/freedesktop/NetworkManager/Devices/3 -- -- -- vpn0 tun unmanaged /org/freedesktop/NetworkManager/Devices/0 -- -- -- nmcli-nm: RUNNING VERSION STATE STARTUP CONNECTIVITY NETWORKING WIFI-HW WIFI WWAN-HW WWAN running 1.2.2 connected started full enabled enabled enabled enabled enabled To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/network-manager/+bug/1632418/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp