Comment 10 for bug 1633362

Here is another system with configuration for a disabled ipv6:

```
$ cat /etc/default/lxd-bridge
# WARNING: This file is generated by a debconf template!
# It is recommended to update it by using "dpkg-reconfigure -p medium lxd"

# Whether to setup a new bridge or use an existing one
USE_LXD_BRIDGE="true"

# Bridge name
# This is still used even if USE_LXD_BRIDGE is set to false
# set to an empty value to fully disable
LXD_BRIDGE="lxdbr0"

# Update the "default" LXD profile
UPDATE_PROFILE="true"

# Path to an extra dnsmasq configuration file
LXD_CONFILE=""

# DNS domain for the bridge
LXD_DOMAIN="lxd"

# IPv4
## IPv4 address (e.g. 10.0.8.1)
LXD_IPV4_ADDR="10.155.123.1"

## IPv4 netmask (e.g. 255.255.255.0)
LXD_IPV4_NETMASK="255.255.255.0"

## IPv4 network (e.g. 10.0.8.0/24)
LXD_IPV4_NETWORK="10.155.123.1/24"

## IPv4 DHCP range (e.g. 10.0.8.2,10.0.8.254)
LXD_IPV4_DHCP_RANGE="10.155.123.2,10.155.123.254"

## IPv4 DHCP number of hosts (e.g. 250)
LXD_IPV4_DHCP_MAX="252"

## NAT IPv4 traffic
LXD_IPV4_NAT="true"

# IPv6
## IPv6 address (e.g. 2001:470:b368:4242::1)
LXD_IPV6_ADDR=""

## IPv6 CIDR mask (e.g. 64)
LXD_IPV6_MASK=""

## IPv6 network (e.g. 2001:470:b368:4242::/64)
LXD_IPV6_NETWORK=""

## NAT IPv6 traffic
LXD_IPV6_NAT="false"

# Run a minimal HTTP PROXY server
LXD_IPV6_PROXY="false"
```

Also with ipv6 disabled via grub

```
GRUB_CMDLINE_LINUX_DEFAULT="ipv6.disable=1"
```