Public bug reported:

After upgrade to artful, boot is considerable slower. By using systemd-analyze 
blame I've managed to narrow it to NetworkManager-wait-online.service.
         30.591s NetworkManager-wait-online.service
         10.240s nmbd.service
          9.273s postfix@-.service
          9.110s apt-daily.service
          6.485s dev-sdb1.device
          5.488s ModemManager.service
          5.318s udisks2.service
          4.968s accounts-daemon.service
          3.807s fwupd.service
          3.049s grub-common.service
          2.837s apport.service
          2.764s NetworkManager.service
          2.413s speech-dispatcher.service
          2.362s snapd.service
          2.160s networking.service
          2.083s pppd-dns.service
          2.078s lm-sensors.service
          2.073s gpu-manager.service
          2.066s alsa-restore.service
          1.570s smbd.service
          1.380s rsyslog.service
          1.310s polkit.service
          1.117s apparmor.service

ProblemType: Bug
DistroRelease: Ubuntu 17.10
Package: network-manager 1.8.4-1ubuntu3
ProcVersionSignature: Ubuntu 4.13.0-16.19-generic 4.13.4
Uname: Linux 4.13.0-16-generic x86_64
ApportVersion: 2.20.7-0ubuntu3
Architecture: amd64
CurrentDesktop: Budgie:GNOME
Date: Mon Oct 16 00:18:09 2017
IfupdownConfig:
 # interfaces(5) file used by ifup(8) and ifdown(8)
 auto lo
 iface lo inet loopback
IpRoute:
 default via 192.168.1.1 dev enp2s0 proto static metric 100 
 169.254.0.0/16 dev enp2s0 scope link metric 1000 
 192.168.1.0/24 dev enp2s0 proto kernel scope link src 192.168.1.3 metric 100
NetworkManager.state:
 [main]
 NetworkingEnabled=true
 WirelessEnabled=true
 WWANEnabled=true
RfKill:
 
SourcePackage: network-manager
UpgradeStatus: No upgrade log present (probably fresh install)
nmcli-dev:
 DEVICE         TYPE      STATE         DBUS-PATH                               
   CONNECTION          CON-UUID                              CON-PATH           
                                
 enp2s0         ethernet  connected     
/org/freedesktop/NetworkManager/Devices/4  Wired connection 1  
066da907-ea49-35a2-8b54-b829cc834081  
/org/freedesktop/NetworkManager/ActiveConnection/2 
 enp0s18f2u2    ethernet  disconnected  
/org/freedesktop/NetworkManager/Devices/2  --                  --               
                     --                                                 
 enp0s18f2u2i2  ethernet  unavailable   
/org/freedesktop/NetworkManager/Devices/3  --                  --               
                     --                                                 
 lo             loopback  unmanaged     
/org/freedesktop/NetworkManager/Devices/1  --                  --               
                     --
nmcli-nm:
 RUNNING  VERSION  STATE      STARTUP  CONNECTIVITY  NETWORKING  WIFI-HW  WIFI  
   WWAN-HW  WWAN    
 running  1.8.4    connected  started  full          enabled     enabled  
enabled  enabled  enabled

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


** Tags: amd64 apport-bug artful

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https://bugs.launchpad.net/bugs/1723809

Title:
  NetworkManager-wait-online.service slows down boot

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