[Bug 1785351] Re: package initramfs-tools 0.122ubuntu8.11 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1

[Timo Aaltonen]

Processing triggers for initramfs-tools (0.122ubuntu8.11) ...
update-initramfs: Generating /boot/initrd.img-4.17.4-041704-generic
E: /usr/share/initramfs-tools/hooks/btrfs failed with return 1.
update-initramfs: failed for /boot/initrd.img-4.17.4-041704-generic with 1.
dpkg: error processing package initramfs-tools (--configure):
 subprocess installed post-installation script returned error exit status 1

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Title:
  package initramfs-tools 0.122ubuntu8.11 failed to install/upgrade:
  subprocess installed post-installation script returned error exit
  status 1

Status in initramfs-tools package in Ubuntu:
  Invalid

Bug description:
  I'm not sure why I received this error, but it could be because I'm
  running btrfs-tools v4.17.  (I'm running btrfs on imsm mdadm raid1.)
  The btrfs hooks script has this line in it:

          copy_exec /bin/btrfs-zero-log

  but this program isn't a part of btrfs-progs anymore, replaced by
  "btrfs rescue zero-log"

  Processing triggers for initramfs-tools (0.122ubuntu8.11) ...
  update-initramfs: Generating /boot/initrd.img-4.17.4-041704-generic
  E: /usr/share/initramfs-tools/hooks/btrfs failed with return 1.
  update-initramfs: failed for /boot/initrd.img-4.17.4-041704-generic with 1.
  dpkg: error processing package initramfs-tools (--configure):
   subprocess installed post-installation script returned error exit status 1
  Processing triggers for libc-bin (2.23-0ubuntu10) ...
  Processing triggers for menu (2.1.47ubuntu1.16.04.1) ...
  Errors were encountered while processing:
   initramfs-tools

  ProblemType: Package
  DistroRelease: Ubuntu 16.04
  Package: initramfs-tools 0.122ubuntu8.11
  Uname: Linux 4.17.4-041704-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.18
  Architecture: amd64
  Date: Fri Aug  3 20:52:17 2018
  ErrorMessage: subprocess installed post-installation script returned error exit status 1
  InstallationDate: Installed on 2016-05-30 (795 days ago)
  InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
  PackageArchitecture: all
  RelatedPackageVersions:
   dpkg 1.18.4ubuntu1.4
   apt  1.2.27
  SourcePackage: initramfs-tools
  Title: package initramfs-tools 0.122ubuntu8.11 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1
  UpgradeStatus: No upgrade log present (probably fresh install)

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