[Bug 1519120] Re: NetworkManager VLAN support fails unless vlan package is manually installed

[Robie Basak]

Actually, in hindsight after renaming the bug, it looks like there are
two bugs identified here. 1) NetworkManager does not depend on or
recommend the vlan package, and silently breaks when it isn't installed;
and 2) from comments 4 and 5, there is a separate issue with a glob
match for NICs in ifupdown.

Since Mike filed this bug originally, I think it makes sense to track
this bug as the first issue. For the second issue, SwaJime and Arnaud,
please could you use a separate bug to track this?

It's the second issue I spotted that caused me to assign Wes this bug,
but thank you for looking at the NetworkManager GUI issue too!

One complication is that this change would pull vlan onto a bunch of CD
images. I'd like feedback from the release or SRU teams before
sponsoring this. Or, Mathieu, as this is Network Manager related, would
you mind chiming in please?

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

Title:
  NetworkManager VLAN support fails unless vlan package is manually
  installed

Status in network-manager package in Ubuntu:
  Confirmed
Status in vlan package in Ubuntu:
  Invalid

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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