[Bug 1568560] Re: nm_device_get_device_type: assertion 'NM_IS_DEVICE (self)' failed

[KF Lee]

My network consists of:
2: enp8s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000
    inet 10.1.1.1/24 brd 10.1.1.255 scope global enp8s0
3: wlp4s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000
    inet 192.168.99.2/24 brd 192.168.99.255 scope global wlp4s0
5: ppp0: <POINTOPOINT,MULTICAST,NOARP,UP,LOWER_UP> mtu 1484 qdisc pfifo_fast state UNKNOWN group default qlen 3
    inet 220.132.100.42 peer 168.95.98.254/32 scope global ppp0

and it seems all work ok except the service networking status keep showing:
   Active: failed (Result: exit-code) since Sun 2018-03-25 20:47:42 CST; 53min ago
     Docs: man:interfaces(5)
  Process: 953 ExecStart=/sbin/ifup -a --read-environment (code=exited, status=1/FAILURE)
  Process: 859 ExecStartPre=/bin/sh -c [ "$CONFIGURE_INTERFACES" != "no" ] && [ -n "$(ifquery --read-environment --list --exclude=lo)" 
 Main PID: 953 (code=exited, status=1/FAILURE)

cant find a fix and lead to also see in service NetworkManager status:
NetworkManager[933]: nm_device_get_device_type: assertion 'NM_IS_DEVICE (self)' failed

but the point is the network function normally, are these two issues
related and what's the cause ?

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https://bugs.launchpad.net/bugs/1568560

Title:
  nm_device_get_device_type: assertion 'NM_IS_DEVICE (self)' failed

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