I think those instructions are too complicated - `sh -c` will be difficult to parse for new (or even experienced) users and is error prone. Nevertheless, the instructions as is will not work because the redirection does not run as root, as is the case for the other instructions. This was probably forgotten when adding the backports entry (which goes to show this is error-prone). (I would instead recommend "piping to tee", like `echo ... | sudo tee -a sources.list`, for example.)

As we don't build it for now. We should readd it once we get snap.

AFAIK, there is no packages for bionic yet.

I was killing time while micah was working hard pushing those packages
to the release component.

I think some day I'll manage to make this look simple.