I had the problem of ubuntu-fan not being installed after the upgrade to
17.10/18.04, please mark ubuntu-fan as a dependency to NetworkManager or
something to fix this. It was by pure chance I ended up here to find a
way to debug this problem.

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https://bugs.launchpad.net/bugs/1583182

Title:
  error on 01ifupdown script

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

Bug description:
  When bring the interface up or down I see this message on the logs

  May 18 10:03:36 count0 nm-dispatcher[8608]: req:1 'up' [enp2s0], 
"/etc/NetworkManager/dispatcher.d/01ifupdown": complete: failed with Script 
'/etc/NetworkManager/dispatcher.d/01ifupdown' exited with error status 1.
  May 18 10:03:36 count0 NetworkManager[791]: <warn>  [1463576616.8466] 
dispatcher: (29) 01ifupdown failed (failed): Script 
'/etc/NetworkManager/dispatcher.d/01ifupdown' exited with error status 1.

  
  Tracing the problem I see that the call to /usr/sbin/fanctl is done with 
incorrect parameters.

  If I execute 
  /etc/NetworkManager/dispatcher.d/01ifupdown enp2s0 down

  I get this error
  run-parts: /etc/network/if-post-down.d/ubuntu-fan exited with return code 1

  ubuntu-fan is doing the call in following way

  /usr/sbin/fanctl net "$MODE" "$IFACE"

  and the parameters passed by ubuntu-fan are

  $MODE=stop
  $IFACE=enp2s0

  
  but fanctl expect other parameters as showed on the script's header

  
  --------------
  details

  lsb_release -rd
  Description:  Ubuntu 16.04 LTS
  Release:      16.04

  $ apt-cache policy network-manager
  network-manager:
    Installed: 1.1.93-0ubuntu4
    Candidate: 1.1.93-0ubuntu4
    Version table:
   *** 1.1.93-0ubuntu4 500
          500 http://ar.archive.ubuntu.com/ubuntu xenial/main amd64 Packages
          100 /var/lib/dpkg/status

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: network-manager 1.1.93-0ubuntu4
  ProcVersionSignature: Ubuntu 4.4.0-22.40-generic 4.4.8
  Uname: Linux 4.4.0-22-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Wed May 18 10:50:24 2016
  IfupdownConfig:
   # interfaces(5) file used by ifup(8) and ifdown(8)
   auto lo
   iface lo inet loopback
  InstallationDate: Installed on 2016-04-23 (24 days ago)
  InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 
(20160420.1)
  IpRoute:
   default via 192.168.1.1 dev enp2s0  proto static  metric 100 
   169.254.0.0/16 dev enp2s0  scope link  metric 1000 
   172.17.0.0/16 dev docker0  proto kernel  scope link  src 172.17.0.1 linkdown 
   172.18.0.0/16 dev br-76f79dfb13e0  proto kernel  scope link  src 172.18.0.1 
linkdown 
   192.168.1.0/24 dev enp2s0  proto kernel  scope link  src 192.168.1.8  metric 
100
  NetworkManager.state:
   [main]
   NetworkingEnabled=true
   WirelessEnabled=true
   WWANEnabled=true
  RfKill:
   0: hci0: Bluetooth
        Soft blocked: no
        Hard blocked: no
  SourcePackage: network-manager
  UpgradeStatus: No upgrade log present (probably fresh install)
  nmcli-dev:
   DEVICE           TYPE      STATE      DBUS-PATH                              
    CONNECTION          CON-UUID                              CON-PATH          
                                 
   br-76f79dfb13e0  bridge    connected  
/org/freedesktop/NetworkManager/Devices/2  br-76f79dfb13e0     
0a9f5c9b-cd67-4fb8-a72d-1811ca6fbb68  
/org/freedesktop/NetworkManager/ActiveConnection/1 
   docker0          bridge    connected  
/org/freedesktop/NetworkManager/Devices/3  docker0             
e5f99f7d-532f-4c52-8749-c78afa9271dd  
/org/freedesktop/NetworkManager/ActiveConnection/2 
   enp2s0           ethernet  connected  
/org/freedesktop/NetworkManager/Devices/0  Wired connection 1  
ee3ec6ee-7242-4956-9d19-20ccb19c5fe5  
/org/freedesktop/NetworkManager/ActiveConnection/8 
   lo               loopback  unmanaged  
/org/freedesktop/NetworkManager/Devices/1  --                  --               
                     --
  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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