Public bug reported:

After the laptop has resumed from suspend, there are no Wi-Fi networks
listed in the network manager applet. The connection still works but the
applet shows the Ethernet connection icon.

Steps to reproduce:
1) close the laptop lid to enter suspend (or click "suspend" in the system menu 
in the upper panel)
2) re-open the laptop lid, resuming the laptop from suspend, unlock the screen
3) check the network manager applet, no Wi-Fi networks are listed, disabling 
and re-enabling Wi-Fi doesn't help

This is a problem because it isn't possible to connect to another Wi-Fi
network.

The problem disappears if i run:

sudo systemctl restart network-manager.service

as described here: https://askubuntu.com/a/761220, however, the systemd
unit file solution suggested in the same answer doesn't work, probably
due to a timing issue (the command is run too early and the Wi-Fi card
is not ready).

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: network-manager 1.2.6-0ubuntu0.16.04.2
ProcVersionSignature: Ubuntu 4.13.0-32.35~16.04.1-generic 4.13.13
Uname: Linux 4.13.0-32-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.15
Architecture: amd64
CurrentDesktop: Unity
Date: Sun Feb  4 22:55:37 2018
IfupdownConfig:
 # interfaces(5) file used by ifup(8) and ifdown(8)
 auto lo
 iface lo inet loopback
InstallationDate: Installed on 2018-01-30 (4 days ago)
InstallationMedia: Ubuntu 16.04.3 LTS "Xenial Xerus" - Release amd64 (20170801)
IpRoute:
 default via 192.168.1.254 dev wlp2s0  proto static  metric 600 
 169.254.0.0/16 dev wlp2s0  scope link  metric 1000 
 172.17.0.0/16 dev docker0  proto kernel  scope link  src 172.17.0.1 linkdown 
 192.168.1.0/24 dev wlp2s0  proto kernel  scope link  src 192.168.1.145  metric 
600 
 192.168.122.0/24 dev virbr0  proto kernel  scope link  src 192.168.122.1 
linkdown
NetworkManager.state:
 [main]
 NetworkingEnabled=true
 WirelessEnabled=true
 WWANEnabled=true
ProcEnviron:
 LANGUAGE=it
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=it_IT.UTF-8
 SHELL=/bin/bash
SourcePackage: network-manager
UpgradeStatus: No upgrade log present (probably fresh install)
nmcli-nm:
 RUNNING  VERSION  STATE      STARTUP  CONNECTIVITY  NETWORKING  WIFI-HW  WIFI  
   WWAN-HW  WWAN    
 running  1.2.6    connected  started  full          enabled     enabled  
enabled  enabled  enabled

** Affects: network-manager (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug xenial

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https://bugs.launchpad.net/bugs/1747307

Title:
  Wi-Fi networks list is empty after resume from suspend

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