I discovered that I could not start containers with `lxc` unless I created the files `/etc/sub{u,g}id`; I put exactly the contents stated on the Wiki at https://www.funtoo.org/LXD

 Next, we come to the concept of "subuid" and "subgid". Typically, a user will get one user id and one group id. Subids and subgids allow us to assign additional UIDs and GIDs to a user for their own uses. By default, LXD will allocate subuids for the root user, which is equivalent of creating the following files on the root filesystem:

Code listings follow for both files showing the contents:

`root:1000000:10000000000`

That's what is in those files on `alkaline` so I did the same on my local system and was able to start containers.

I think we need to update the documentation to reflect the reality that those files are needed; or we need to ensure that they get created with default values.