This bug was fixed in the package initramfs-tools - 0.130ubuntu3.13
---------------
initramfs-tools (0.130ubuntu3.13) bionic; urgency=medium
* Backport zstd and lz4 support from focal. LP: #1932542
-- Dimitri John Ledkov <dimitri.led...@canonical.com> Thu, 01 Jul 2021
14:11:48 +0100
** Changed in: initramfs-tools (Ubuntu Bionic)
Status: Fix Committed => Fix Released
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https://bugs.launchpad.net/bugs/1932542
Title:
Add support for zstd
Status in initramfs-tools package in Ubuntu:
Fix Released
Status in initramfs-tools source package in Bionic:
Fix Released
Status in initramfs-tools source package in Focal:
Fix Released
Bug description:
[Impact]
* initramfs-tools in impish has changed default initrd compression to
zstd. To allow compressing and uncompressing such initrds on Focal LTS
release we should backport zstd support in the mkinitramfs &
unmkinitramffs tooling. For example ubuntu-cdimage uses unmkinitramfs
tool to unpack and inspect impish initrds on a focal host.
* Cherrypicking the feature from 0.138 release, which is also present
in Hirsute and Impish.
[Test Plan]
* Create initrd with zstd $ mkinitramfs -c zstd -o zstd-initrd.img
* Uncompress it with $ unmkinitramfs ./zstd-initrd.img zstd-initrd-
unpacked
* For bionic also repeat the same with lz4.
[Where problems could occur]
* This adds support for zstd compressed initrd in both mkinitramfs
and unmkinitramfs. However our GA kernels do not support zstd
compressed initrds. And depends on zstd package is not added either.
Meaning one still has to install zstd to gain the unpack support.
Changing initramfs.conf to zstd may result in unbootable instance when
used with GA kernel.
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