[Bug 1568829] Re: nm-applet icon not showing when /proc is mounted with hidepid!=0

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Title:
  nm-applet icon not showing when /proc is mounted with hidepid!=0

Status in Network Manager Applet:
  New
Status in network-manager-applet package in Ubuntu:
  Confirmed

Bug description:
  Steps to reproduce:

  1. (Re-)mount /proc with hidepid=1 (or =2)
  2. Restart nm-applet

  nm-applet's icon does not reappear after the restart. This used to
  work with version 1.0.

  
  Original bug description:

  Since I upgraded to -proposed network-manager and network-manager-gnome versions, nm-applet no longer works.
  Manually starting it on a console give:

  $ nm-applet

  (nm-applet:6250): nm-applet-WARNING **: GDBus.Error:org.freedesktop.NetworkManager.AgentManager.PermissionDenied: Unable to determine request sender and UID.
  (nm-applet:6250): libnm-CRITICAL **: nm_client_get_nm_running: assertion 'NM_IS_CLIENT (client)' failed
  (nm-applet:6250): libnm-CRITICAL **: nm_client_get_state: assertion 'NM_IS_CLIENT (client)' failed
  (nm-applet:6250): libnm-CRITICAL **: nm_client_networking_get_enabled: assertion 'NM_IS_CLIENT (client)' failed
  (nm-applet:6250): libnm-CRITICAL **: nm_client_wireless_get_enabled: assertion 'NM_IS_CLIENT (client)' failed
  (nm-applet:6250): libnm-CRITICAL **: nm_client_wireless_hardware_get_enabled: assertion 'NM_IS_CLIENT (client)' failed
  (nm-applet:6250): libnm-CRITICAL **: nm_client_wwan_get_enabled: assertion 'NM_IS_CLIENT (client)' failed
  (nm-applet:6250): libnm-CRITICAL **: nm_client_wwan_hardware_get_enabled: assertion 'NM_IS_CLIENT (client)' failed
  (nm-applet:6250): libnm-CRITICAL **: nm_client_get_devices: assertion 'NM_IS_CLIENT (client)' failed

  What's odd is the NM and NM-gnome base versions are not identical:

  $ apt-cache policy network-manager network-manager-gnome
  network-manager:
    Installed: 1.1.93-0ubuntu1
    Candidate: 1.1.93-0ubuntu1
    Version table:
   *** 1.1.93-0ubuntu1 500
          500 http://archive.ubuntu.com/ubuntu xenial-proposed/main amd64 Packages
          100 /var/lib/dpkg/status
       1.0.4-0ubuntu10 500
          500 http://archive.ubuntu.com/ubuntu xenial/main amd64 Packages
  network-manager-gnome:
    Installed: 1.1.93-1ubuntu1
    Candidate: 1.1.93-1ubuntu1
    Version table:
   *** 1.1.93-1ubuntu1 500
          500 http://archive.ubuntu.com/ubuntu xenial-proposed/main amd64 Packages
          100 /var/lib/dpkg/status
       1.0.10-1ubuntu1 500
          500 http://archive.ubuntu.com/ubuntu xenial/main amd64 Packages

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: network-manager-gnome 1.1.93-1ubuntu1
  ProcVersionSignature: Ubuntu 4.4.0-18.34-generic 4.4.6
  Uname: Linux 4.4.0-18-generic x86_64
  NonfreeKernelModules: zfs zunicode zcommon znvpair zavl
  ApportVersion: 2.20.1-0ubuntu1
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Mon Apr 11 08:16:59 2016
  NetworkManager.state:
   [main]
   NetworkingEnabled=true
   WirelessEnabled=true
   WWANEnabled=true
   WimaxEnabled=true
  RfKill:
   0: phy0: Wireless LAN
    Soft blocked: no
    Hard blocked: no
  SourcePackage: network-manager-applet
  UpgradeStatus: No upgrade log present (probably fresh install)
  nmcli-con:
   Error: command ['nmcli', '-f', 'all', 'con'] failed with exit code 1:
   (process:7301): nmcli-CRITICAL **: Error: Could not create NMClient object: Unable to authenticate request..
  nmcli-dev:
   Error: command ['nmcli', '-f', 'all', 'dev'] failed with exit code 1:
   (process:7297): nmcli-CRITICAL **: Error: Could not create NMClient object: Unable to authenticate request..
  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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