Comment 1 for bug 1585233

We do not have a tar of any type available for artful.
I came across this pain twice in the past week.
a.) curtin would like to have a .tar file to install
   https://gist.github.com/smoser/375123ef1ef098be23cc856a5772c5c8
It could grow support for installing from a squashfs image, but tar just makes more sense.

b.) rooturl cloud-initramfs-rooturl makes more sense to use a .tar.gz
   root=http://.../some.tar.xz makes more sense than .squashfs.
   To use the squashfs, rooturl has to download the whole thing and then mount
it, and then because squashfs is not writable, we need to do overlayroot.

Thus, instead of:
   root=<url>.tar.xz

We have to do:
   root=<url>.squashfs overlayroot=tmpfs

I ran into this need when trying to test bug 1711760.

In summary, the .tar.xz (or .tar.gz) was just very useful and serves a purpose not served by other formats. Please bring it back.