My understanding had been incorrect and this is not an issue in this package at all. The initramfs present in the cloud-image at first boot is created by live-build with lzma compression. Subsequent kernel installs that produce a new initramfs or updates to an existing initramfs will be compressed with the default gzip compression per the shipped default in initramfs-tools. This mismatch is due to live-build invocation and not this package. Marking invalid.
** Changed in: initramfs-tools (Ubuntu) Status: Incomplete => Invalid -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to initramfs-tools in Ubuntu. https://bugs.launchpad.net/bugs/1741563 Title: initramfs compression changed in bionic for shipped kernel Status in initramfs-tools package in Ubuntu: Invalid 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 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/initramfs-tools/+bug/1741563/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp