[Bug 1947871] Re: package linux-image-5.11.0-38-generic 5.11.0-38.42~20.04.1 failed to install/upgrade: run-parts: /etc/kernel/postinst.d/initramfs-tools exited with return code 1

[Alistair]

Identified that the command :

update-initramfs: Generating /boot/initrd.img-5.11.0-38-generic

required approx 88M of disk space on /boot, but I only had 73M:
df -h /boot
bpool/BOOT/ubuntu_l3g9y7                          286M  213M   73M  75% /boot

Problem resolved by manually running zsys garbage collection (laptop, so
scheduled jobs are unable  to run when the laptop is off/hybernating.

To demonstrate, use "zsysctl machine show to list the ZFS snapshots that
are part of zsys.  Use with wc to show the number of snapshots before
garbage collection and after, hopefully with a reduction:

zsysctl machine show|wc
    127     468    7959
zsysctl service gc
zsysctl machine show|wc
    105     381    6350

Free space after this has run:
df -lh /boot
Filesystem                Size  Used Avail Use% Mounted on
bpool/BOOT/ubuntu_l3g9y7  375M  202M  174M  54% /boot

Monitoring the Avail space for boot while re-running apt upgrade :
 df -h /boot
Filesystem                Size  Used Avail Use% Mounted on
bpool/BOOT/ubuntu_l3g9y7  375M  289M   86M  78% /boot
before returning to 174M available.
zfs list -r bpool
NAME                       USED  AVAIL     REFER  MOUNTPOINT
bpool                     1.58G   174M       96K  /boot
bpool/BOOT                1.58G   174M       96K  none
bpool/BOOT/ubuntu_l3g9y7  1.58G   174M      201M  /boot

The used space in this case is in zfs snapshots, hence zsys garbage
collection resolved this.

Where zfs and zsys are installed, checking free space and "bloat"
required space, with the option/suggestion to run "zsysctl service gc".

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Title:
  package linux-image-5.11.0-38-generic 5.11.0-38.42~20.04.1 failed to
  install/upgrade: run-parts: /etc/kernel/postinst.d/initramfs-tools
  exited with return code 1

Status in initramfs-tools package in Ubuntu:
  New

Bug description:
  System error reported - while reading webpage.  last login in last 10 minutes, so possibly an auto update.
  lsb_release -a
  No LSB modules are available.
  Distributor ID:	Ubuntu
  Description:	Ubuntu 20.04.3 LTS
  Release:	20.04
  Codename:	focal
  uname -a
  Linux alistair-HP-EliteBook-8470p 5.11.0-37-generic #41~20.04.2-Ubuntu SMP Fri Sep 24 09:06:38 UTC 2021 x86_64 x86_64 x86_64

  ProblemType: Package
  DistroRelease: Ubuntu 20.04
  Package: linux-image-5.11.0-38-generic 5.11.0-38.42~20.04.1
  ProcVersionSignature: Ubuntu 5.11.0-37.41~20.04.2-generic 5.11.22
  Uname: Linux 5.11.0-37-generic x86_64
  NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
  ApportVersion: 2.20.11-0ubuntu27.20
  Architecture: amd64
  CasperMD5CheckResult: skip
  Date: Wed Oct 20 13:55:09 2021
  ErrorMessage: run-parts: /etc/kernel/postinst.d/initramfs-tools exited with return code 1
  InstallationDate: Installed on 2020-11-12 (342 days ago)
  InstallationMedia: Ubuntu 20.04.1 LTS "Focal Fossa" - Release amd64 (20200731)
  Python3Details: /usr/bin/python3.8, Python 3.8.10, python3-minimal, 3.8.2-0ubuntu2
  PythonDetails: /usr/bin/python3.8, Python 3.8.10, python-is-python3, 3.8.2-4
  RelatedPackageVersions:
   dpkg 1.19.7ubuntu3
   apt  2.0.6
  SourcePackage: initramfs-tools
  Title: package linux-image-5.11.0-38-generic 5.11.0-38.42~20.04.1 failed to install/upgrade: run-parts: /etc/kernel/postinst.d/initramfs-tools exited with return code 1
  UpgradeStatus: No upgrade log present (probably fresh install)

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