This bug was fixed in the package initramfs-tools - 0.140ubuntu5
--------------- initramfs-tools (0.140ubuntu5) impish; urgency=medium
* Switch default initramfs compression to zstd, as it produces the lower overall boot time. LP: #1931725
-- Dimitri John Ledkov <email address hidden> Fri, 11 Jun 2021 16:55:30 +0100
This bug was fixed in the package initramfs-tools - 0.140ubuntu5
---------------
initramfs-tools (0.140ubuntu5) impish; urgency=medium
* Switch default initramfs compression to zstd, as it produces the lower
overall boot time. LP: #1931725
-- Dimitri John Ledkov <email address hidden> Fri, 11 Jun 2021 16:55:30 +0100