I have the same problem in 16.04 for my Wifi.
$ lspci -knn | grep Net -A2
04:00.0 Network controller [0280]: Qualcomm Atheros AR9485 Wireless Network
Adapter [168c:0032] (rev 01)
Subsystem: AzureWave AR9485 Wireless Network Adapter [1a3b:2126]
Kernel driver in use: ath9k
Kernel modules: ath9k
The following command fixes my problem
"sudo systemctl restart NetworkManager"
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You received this bug notification because you are a member of Desktop
Packages, which is subscribed to network-manager in Ubuntu.
https://bugs.launchpad.net/bugs/1448555
Title:
network-manager does not autoconnect to wifi network after resume from
suspend
Status in network-manager package in Ubuntu:
Confirmed
Bug description:
After upgrading to 15.04 network manager does not reconnect to the
wifi network after resuming from a suspend to memory.
Workaround:
disable and re-enable wireless network -> connects immediately
ProblemType: Bug
DistroRelease: Ubuntu 15.04
Package: network-manager 0.9.10.0-4ubuntu15
ProcVersionSignature: Ubuntu 3.19.0-15.15-generic 3.19.3
Uname: Linux 3.19.0-15-generic x86_64
NonfreeKernelModules: nvidia wl
ApportVersion: 2.17.2-0ubuntu1
Architecture: amd64
CurrentDesktop: Unity
Date: Sat Apr 25 23:53:54 2015
IfupdownConfig:
# interfaces(5) file used by ifup(8) and ifdown(8)
auto lo
iface lo inet loopback
InstallationDate: Installed on 2013-05-17 (708 days ago)
InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64+mac
(20130424)
IpRoute:
default via 10.1.0.254 dev wlan0 proto static metric 1024
10.0.0.0/8 dev wlan0 proto kernel scope link src 10.1.0.103
169.254.0.0/16 dev wlan0 scope link metric 1000
NetworkManager.state:
[main]
NetworkingEnabled=true
WirelessEnabled=true
WWANEnabled=true
WimaxEnabled=true
SourcePackage: network-manager
UpgradeStatus: Upgraded to vivid on 2015-04-25 (0 days ago)
nmcli-dev:
DEVICE TYPE STATE DBUS-PATH
CONNECTION CON-UUID CON-PATH
wlan0 wifi connected
/org/freedesktop/NetworkManager/Devices/1 rsb_hs
d8793959-2da1-4dc6-85ad-2dcf9e36e64b
/org/freedesktop/NetworkManager/ActiveConnection/1
EC:88:92:61:E9:5F bt disconnected
/org/freedesktop/NetworkManager/Devices/2 -- --
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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'.
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