(bionic-amd64)root@ottawa:/tmp# dpkg-query -W initramfs-tools liblz4-tool zstd
initramfs-tools 0.130ubuntu3.13
liblz4-tool     0.0~r131-2ubuntu3.1
zstd    1.3.3+dfsg-2ubuntu1.2

(bionic-amd64)root@ottawa:/tmp# mkinitramfs -c zstd -o zstd-initrd.img 
4.15.0-150-generic
(bionic-amd64)root@ottawa:/tmp# mkinitramfs -c lz4 -o lz4-initrd.img 
4.15.0-150-generic
(bionic-amd64)root@ottawa:/tmp# unmkinitramfs ./zstd-initrd.img zstd-unpacked
(bionic-amd64)root@ottawa:/tmp# unmkinitramfs ./lz4-initrd.img lz4-unpacked  
(bionic-amd64)root@ottawa:/tmp# ls zstd-unpacked/
bin  conf  etc  init  lib  lib64  run  sbin  scripts
(bionic-amd64)root@ottawa:/tmp# ls lz4-unpacked/
bin  conf  etc  init  lib  lib64  run  sbin  scripts

(bionic-amd64)root@ottawa:/tmp# file zstd-initrd.img 
zstd-initrd.img: Zstandard compressed data (v0.8+), Dictionary ID: None
(bionic-amd64)root@ottawa:/tmp# file lz4-initrd.img 
lz4-initrd.img: LZ4 compressed data (v0.1-v0.9)

All is good.

** Tags removed: verification-needed verification-needed-bionic
** Tags added: verification-done verification-done-bionic

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https://bugs.launchpad.net/bugs/1932542

Title:
  Add support for zstd

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