[Bug 1668693] [NEW] netplan fails to parse 'mtu' key

[Ryan Harper]

Public bug reported:

1. root at z1:/etc/netplan# lsb_release -rd
Description:	Ubuntu Zesty Zapus (development branch)
Release:	17.04

2. root at z1:/etc/netplan# apt-cache policy nplan
nplan:
  Installed: 0.18
  Candidate: 0.18
  Version table:
 *** 0.18 500
        500 http://archive.ubuntu.com/ubuntu zesty/main amd64 Packages
        100 /var/lib/dpkg/status

3. netplan generate renders a config with MTU setting

4. root at z1:/etc/netplan# netplan generate
Error in network definition //etc/netplan/simple.yaml line 4 column 6: unknown key mtu

root at z1:/etc/netplan# cat simple.yaml 
network:
  version: 2
  ethernets:
    eno1:
      dhcp4: true
      mtu: 1280

ProblemType: Bug
DistroRelease: Ubuntu 17.04
Package: nplan 0.18
ProcVersionSignature: Ubuntu 4.4.0-62.83-generic 4.4.40
Uname: Linux 4.4.0-62-generic x86_64
ApportVersion: 2.20.4-0ubuntu2
Architecture: amd64
Date: Tue Feb 28 16:47:13 2017
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
SourcePackage: nplan
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: nplan (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug curtin uec-images zesty

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https://bugs.launchpad.net/bugs/1668693

Title:
  netplan fails to parse 'mtu' key

Status in nplan package in Ubuntu:
  New

Bug description:
  1. root at z1:/etc/netplan# lsb_release -rd
  Description:	Ubuntu Zesty Zapus (development branch)
  Release:	17.04

  2. root at z1:/etc/netplan# apt-cache policy nplan
  nplan:
    Installed: 0.18
    Candidate: 0.18
    Version table:
   *** 0.18 500
          500 http://archive.ubuntu.com/ubuntu zesty/main amd64 Packages
          100 /var/lib/dpkg/status

  3. netplan generate renders a config with MTU setting

  4. root at z1:/etc/netplan# netplan generate
  Error in network definition //etc/netplan/simple.yaml line 4 column 6: unknown key mtu

  root at z1:/etc/netplan# cat simple.yaml 
  network:
    version: 2
    ethernets:
      eno1:
        dhcp4: true
        mtu: 1280

  ProblemType: Bug
  DistroRelease: Ubuntu 17.04
  Package: nplan 0.18
  ProcVersionSignature: Ubuntu 4.4.0-62.83-generic 4.4.40
  Uname: Linux 4.4.0-62-generic x86_64
  ApportVersion: 2.20.4-0ubuntu2
  Architecture: amd64
  Date: Tue Feb 28 16:47:13 2017
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
  SourcePackage: nplan
  UpgradeStatus: No upgrade log present (probably fresh install)

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