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[hobbes <1422143@xxxxxxxxxxxxxxxxxx>]

*** This bug is a duplicate of bug 1270257 ***
    https://bugs.launchpad.net/bugs/1270257

Adding the comment here since the solution only appears in the duplicate thread:
The workaround that works for me is to switch Ubuntu 15.04 to upstart.
Thanks to Mentis for the original post.

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https://bugs.launchpad.net/bugs/1422143

Title:
  No wifi connection after suspend with systemd

Status in One Hundred Papercuts:
  Confirmed
Status in NetworkManager:
  Unknown
Status in network-manager package in Ubuntu:
  Incomplete

Bug description:
  Using systemd as my default init system if I resume from suspend my
  laptop, it doesn't automatically reconnect to the wireless network and
  it doesn't list the available network connections.

  The only way to get a wireless connection is to restart the network-
  manager daemon or going to the gnome-control-center, disable wireless
  and enable it again.

  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: network-manager 0.9.10.0-4ubuntu6
  Uname: Linux 3.19.0-031900-generic x86_64
  NonfreeKernelModules: wl
  ApportVersion: 2.16.1-0ubuntu2
  Architecture: amd64
  Date: Sun Feb 15 18:27:39 2015
  IfupdownConfig:
   # interfaces(5) file used by ifup(8) and ifdown(8)
   auto lo
   iface lo inet loopback
  InstallationDate: Installed on 2014-10-22 (116 days ago)
  InstallationMedia: Ubuntu-GNOME 14.10 "Utopic Unicorn" - Alpha amd64 (20140923)
  IpRoute:
   default via 10.0.0.1 dev wlan0  proto static  metric 1024 
   10.0.0.0/24 dev wlan0  proto kernel  scope link  src 10.0.0.36 
   169.254.0.0/16 dev wlan0  scope link  metric 1000
  SourcePackage: network-manager
  UpgradeStatus: Upgraded to vivid on 2015-01-13 (32 days ago)
  nmcli-dev:
   DEVICE   TYPE      STATE        DBUS-PATH                                  CONNECTION       CON-UUID                              CON-PATH                                           
   wlan0    wifi      connected    /org/freedesktop/NetworkManager/Devices/2  openhost_caldas  09d1f69d-d3da-4978-a69c-d94455db7ecf  /org/freedesktop/NetworkManager/ActiveConnection/0 
   docker0  bridge    unavailable  /org/freedesktop/NetworkManager/Devices/3  --               --                                    --                                                 
   eth0     ethernet  unavailable  /org/freedesktop/NetworkManager/Devices/1  --               --                                    --                                                 
   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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