Public bug reported:

Sometimes, after waking up the laptop from hibernation, nm-applet won't
scan for networks. In these cases, the list of available Wifis can be
just outdated or directly empty.

Switching Wireless on/off and Network on/off doesn't trigger a scan.

Usually running  sudo iwlist <interface> scan on a terminal makes the
wifi networks available immediately in nm-applet

I'm using 16.04 (ubt had the same problem on 15.10)
network-manager-gnome:
  Installed: 1.2.0-0ubuntu0.16.04.4

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

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https://bugs.launchpad.net/bugs/1630336

Title:
  NM doesn't scan for wifi networks after hibernation

Status in network-manager-applet package in Ubuntu:
  New

Bug description:
  Sometimes, after waking up the laptop from hibernation, nm-applet
  won't scan for networks. In these cases, the list of available Wifis
  can be just outdated or directly empty.

  Switching Wireless on/off and Network on/off doesn't trigger a scan.

  Usually running  sudo iwlist <interface> scan on a terminal makes the
  wifi networks available immediately in nm-applet

  I'm using 16.04 (ubt had the same problem on 15.10)
  network-manager-gnome:
    Installed: 1.2.0-0ubuntu0.16.04.4

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/network-manager-applet/+bug/1630336/+subscriptions

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