我使用所有默认设置安装了 LXD，但是出现错误：
$ snapcraft cleanbuild
Something seems to be wrong with your installation of LXD. Refer to the documentation at https://linuxcontainers.org/lxd/getting-started-cli.
我跟着本教程，但 snapcraft 仍然无法执行 cleanbuild。我该如何解决这个问题？
LXD 默认值：
Do you want to configure a new storage pool (yes/no) [default=yes]? yes
Name of the new storage pool [default=default]:
Name of the storage backend to use (dir, btrfs, ceph, lvm, zfs) [default=zfs]:
Create a new ZFS pool (yes/no) [default=yes]?
Would you like to use an existing block device (yes/no) [default=no]?
Size in GB of the new loop device (1GB minimum) [default=34GB]:
Would you like LXD to be available over the network (yes/no) [default=no]?
Would you like stale cached images to be updated automatically (yes/no) [default=yes]?
Would you like to create a new network bridge (yes/no) [default=yes]?
What should the new bridge be called [default=lxdbr0]?
What IPv4 address should be used (CIDR subnet notation, “auto” or “none”) [default=auto]?
What IPv6 address should be used (CIDR subnet notation, “auto” or “none”) [default=auto]?
LXD has been successfully configured.