Public bug reported:

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" ]
```

** Affects: ubuntu
     Importance: Undecided
         Status: New

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

Title:
  Installing via IPv6 results in invalid netplan yaml

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