Install via tarball? (Was: Why does Ubuntu 18.04 doesn't create multiple BTRFS subvolumes anymore during installation by default?)

[Ken D'Ambrosio]

On 2018-10-02 09:46, Tom H wrote:

> I have no idea whether a subiquity yaml file can be used the way that
> a d-i preseed file can be used. AFAIK, it requires a maas server. I
> haven't really looked into it because I started using tarballs to
> deploy systems (Debian, Funtoo, Gentoo, Ubuntu), a few years ago.

I'll bite: how do you do an install via tarball?  I mean, are you just 
taking a running system, tarring it up, swiping the MBR/partition table, 
and reversing the process afterward?  Or something a bit different?

Just curious,

-Ken