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[Mike Pontillo <mike.pontillo@xxxxxxxxxxxxx>]

After I rebooted, the "vlan100" interface was created. So perhaps this
bug just has to do with the fact that I tried to configure the a VLAN
without the 'vlan' package installed.

** Summary changed:

- Xenial: VLAN interfaces don't work when defined in the UI
+ Xenial: VLAN interfaces don't work until after a reboot

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https://bugs.launchpad.net/bugs/1519120

Title:
  Xenial: VLAN interfaces don't work until after a reboot

Status in network-manager package in Ubuntu:
  New

Bug description:
  I tried to use the network manager UI to define a VLAN interface, and
  nothing happened. There are a few bugs here:

  (1) When creating a VLAN interface through the UI, the "vlan interface
  name" must be filled in. This should just default to <interface-
  name>.<vid>, rather than being a required field. (I typed in "vlan100"
  to get the "Save" button to activate.)

  (2) After creating my VLAN interface, nothing happened. No new
  interface appeared. I then realized that I had not installed the
  "vlan" package, and assumed that NetworkManager therefore could not
  complete configuration of the interface.

  (3) After installing the 'vlan' package (and then telling
  NetworkManager to disconnect and reconnect my Ethernet interface from
  the UI, just for good measure), still no VLAN interfaces were present
  on my system.

  I also tried editing the VLAN interface in the UI, and specifying
  "enp4s0f1.100", but still no VLAN interface came online.

  # apt-cache policy network-manager
  network-manager:
    Installed: 1.0.4-0ubuntu6
    Candidate: 1.0.4-0ubuntu6
    Version table:
   *** 1.0.4-0ubuntu6 0
          500 http://172.16.42.88/ubuntu/ xenial/main amd64 Packages
          100 /var/lib/dpkg/status

  # apt-cache policy vlan
  vlan:
    Installed: 1.9-3.2ubuntu1
    Candidate: 1.9-3.2ubuntu1
    Version table:
   *** 1.9-3.2ubuntu1 0
          500 http://172.16.42.88/ubuntu/ xenial/main amd64 Packages
          100 /var/lib/dpkg/status

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