* On base system upgrade, move extra packages to base.

* Packages to watch out for (new versions often cause upgrade issues):

  - systemd
  - qemu-system-x86
  - linux-image-amd64

* Examining init changes:

  - Get the latest initramfs-tools-core and udev packages
  - Extract /usr/share/initramfs-tools/{scripts,init} into new directory
  - Compare:

    diff -urw <old> <new>

    We currently only use init plus udev in scripts/init-{top,bottom}