[Merge] ~philroche/livecd-rootfs/+git/livecd-rootfs:bugfix/revert-initramfs-tools-removal into livecd-rootfs:ubuntu/master

[Philip Roche]

Philip Roche has proposed merging ~philroche/livecd-rootfs/+git/livecd-rootfs:bugfix/revert-initramfs-tools-removal into livecd-rootfs:ubuntu/master.

Commit message:
Revert of initramfs package removal in KVM image

It was reported and confirmed in LP bug #1875400
(https://bugs.launchpad.net/cloud-images/+bug/1875400) that on the public
KVM cloud image there exists a large list of packages marked for auto-removal.

This should never be the case on a released cloud image.

These packages are marked for auto-removal because in the KVM image binary hook
we removed both initramfs-tools and busybox-initramfs packages. Due to package
dependencies this also removed:

busybox-initramfs* cloud-initramfs-copymods* cloud-initramfs-dyn-netconf*
cryptsetup-initramfs* initramfs-tools* initramfs-tools-core* multipath-tools*
overlayroot* sg3-utils-udev* ubuntu-server*

But it did not remove all the packages that the above list depended on.
This resulted in all those packages being marked for auto-removal because they
were not manually installed nor did they have any manually installed packages
that depended on them.

The removal of initramfs-tools and busybox-initramfs was to avoid the
generation of initramfs in images that should boot initramfsless.

This requirement is obsolete now because the initramfsless boot handling
is now handled via setting GRUB_FORCE_PARTUUID in /etc/default/grub.d/40-force-partuuid.cfg.

In test images I have verified that GRUB_FORCE_PARTUUID is set and that
boot speeds have not regressed.

LP: #1875400


Requested reviews:
  Canonical Cloudware (cloudware)
  Ubuntu Core Development Team (ubuntu-core-dev)
Related bugs:
  Bug #1875400 in cloud-images: "package no longer required on latest focal cloud image"
  https://bugs.launchpad.net/cloud-images/+bug/1875400

For more details, see:
https://code.launchpad.net/~philroche/livecd-rootfs/+git/livecd-rootfs/+merge/384105

Revert of initramfs package removal in KVM image

It was reported and confirmed in LP bug #1875400
(https://bugs.launchpad.net/cloud-images/+bug/1875400) that on the public
KVM cloud image there exists a large list of packages marked for auto-removal.

This should never be the case on a released cloud image.

These packages are marked for auto-removal because in the KVM image binary hook
we removed both initramfs-tools and busybox-initramfs packages. Due to package
dependencies this also removed:

busybox-initramfs* cloud-initramfs-copymods* cloud-initramfs-dyn-netconf*
cryptsetup-initramfs* initramfs-tools* initramfs-tools-core* multipath-tools*
overlayroot* sg3-utils-udev* ubuntu-server*

But it did not remove all the packages that the above list depended on.
This resulted in all those packages being marked for auto-removal because they
were not manually installed nor did they have any manually installed packages
that depended on them.

The removal of initramfs-tools and busybox-initramfs was to avoid the
generation of initramfs in images that should boot initramfsless.

This requirement is obsolete now because the initramfsless boot handling
is now handled via setting GRUB_FORCE_PARTUUID in /etc/default/grub.d/40-force-partuuid.cfg.

In test images I have verified that GRUB_FORCE_PARTUUID is set and that
boot speeds have not regressed.

LP: #1875400

-- 
Your team Ubuntu Core Development Team is requested to review the proposed merge of ~philroche/livecd-rootfs/+git/livecd-rootfs:bugfix/revert-initramfs-tools-removal into livecd-rootfs:ubuntu/master.
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