Install cloud-initramfs-updateroot by entering the following commands in the terminal:
sudo apt update sudo apt install cloud-initramfs-updateroot
Description:
extract a tarball over root filesystem before pivot
Allows kernel command line updateroot=http://your.tar.gz And then tarball will be pulled and extracted over the root.
Homepage: http://launchpad.net/cloud-initramfs-tools
Version: 0.40ubuntu1
Section: universe/admin