Maybe it's this change in the linux source package:
linux (4.11.0-1.6) artful; urgency=low
* Miscellaneous Ubuntu changes
- [Debian] Use default compression for all packages
I'll check with the kernel team. But I thought if the kernel package
was changing which compression was used then initramfs-tools should be
updated to match what is there.
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https://bugs.launchpad.net/bugs/1741563
Title:
initramfs compression changed in bionic for shipped kernel
Status in initramfs-tools package in Ubuntu:
Incomplete
Bug description:
The shipped initrd doesn't match the compression that you'd get if you
update the initrd on bionic:
# A clean bionic cloud-image
$ file /boot/initrd.img-4.13.0-17-generic
/boot/initrd.img-4.13.0-17-generic: LZMA compressed data, streamed
# Update the initramfs (notice the deprecation warnings too)
$ sudo update-initramfs -k all -u
update-initramfs: Generating /boot/initrd.img-4.13.0-17-generic
WARNING: Setting CRYPTSETUP in /etc/initramfs-tools/initramfs.conf is
deprecated and will stop working in the future. Use
/etc/cryptsetup-initramfs/conf-hook instead.
# Now initramfs is gzip compressed when packaged initramfs was LZMA
$ file /boot/initrd.img-4.13.0-17-generic
/boot/initrd.img-4.13.0-17-generic: gzip compressed data, last modified: Fri
Jan 5 20:54:07 2018, from Unix
$ apt-cache policy initramfs-tools
initramfs-tools:
Installed: 0.125ubuntu13
Candidate: 0.125ubuntu13
Version table:
*** 0.125ubuntu13 500
500 http://us-west-2.ec2.archive.ubuntu.com/ubuntu bionic/main amd64
Packages
100 /var/lib/dpkg/status
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