[Bug 1751151] Re: Installing via IPv6 results in invalid netplan yaml

[Mathieu Trudel-Lapierre]

Good catch, this is a bug in netcfg.

** Package changed: debian-installer (Ubuntu) => netcfg (Ubuntu)

** Changed in: netcfg (Ubuntu)
   Importance: Undecided => Critical

** Changed in: netcfg (Ubuntu)
       Status: New => Triaged

** Changed in: netcfg (Ubuntu)
     Assignee: (unassigned) => Mathieu Trudel-Lapierre (cyphermox)

** Changed in: nplan (Ubuntu)
       Status: New => Invalid

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https://bugs.launchpad.net/bugs/1751151

Title:
  Installing via IPv6 results in invalid netplan yaml

Status in netcfg package in Ubuntu:
  Triaged
Status in nplan package in Ubuntu:
  Invalid

Bug description:
  I installed ubuntu 17.10 using the mini iso. The network is IPv6 only, so I used that (successfully) to do a network install of ubuntu 17.10. However, the resulting system
  was unreachable over the network. The installer generated 01-netcfg.yaml looked like:

  ```
  # This file describes the network interfaces available on your system
  # For more information, see netplan(5).
  network:
    version: 2
    renderer: networkd
    ethernets:
      enp24s0f0:
        addresses: [ XXXX:XXX:X:XX::XX:XX/112 ]
        gateway6: XXXX:XXX:X:XX::XX:X
        nameservers:
            search: [ XXXXXXXXX.XX ]
            addresses:
                - XXXX:XXX:X:X::X
  ```

  However,

  `netplan apply` complains:

  `Invalid YAML at //etc/netplan/01-netcfg.yaml line 7 column 23: found
  unexpected ':'`

  This is remedied, by putting the ipv6 address into quotes, i.e.:
  ```
  addresses: [ "XXXX:XXX:X:XX::XX:XX/112" ]
  ```

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