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

[Daniel Axtens]

Hi!

(I'm going through and trying to clean up some old bugs, so apologies if
this is a bit out of the blue.)

I just want to confirm how you got this /etc/netplan/01-netcfg.yaml. If
I understand you correctly it was created by the installer and you had
to insert the quotes manually. Is that right? Or did you create it
manually and it just didn't work until you inserted quotes?

Regards,
Daniel

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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:
  Fix Released
Status in nplan package in Ubuntu:
  Confirmed

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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