Public bug reported:

Happened after upgrading to 18.04 from 16.04. Ubuntu fails to boot with
kernel 4.15 as well.

ProblemType: Package
DistroRelease: Ubuntu 18.04
Package: linux-image-4.15.0-20-generic 4.15.0-20.21
ProcVersionSignature: Ubuntu 4.13.0-39.44-generic 4.13.16
Uname: Linux 4.13.0-39-generic x86_64
ApportVersion: 2.20.9-0ubuntu7
AptOrdering:
 linux-image-4.15.0-20-generic:amd64: Remove
 NULL: ConfigurePending
Architecture: amd64
Date: Tue May 29 16:12:20 2018
DpkgTerminalLog:
 Removing linux-image-4.15.0-20-generic (4.15.0-20.21) ...
 Failed to create or replace /vmlinuz.old: Is a directory at 
/usr/bin/linux-update-symlinks line 72.
 dpkg: error processing package linux-image-4.15.0-20-generic (--remove):
  installed linux-image-4.15.0-20-generic package post-removal script 
subprocess returned error exit status 21
DuplicateSignature:
 package:linux-image-4.15.0-20-generic:4.15.0-20.21
 Removing linux-image-4.15.0-20-generic (4.15.0-20.21) ...
 Failed to create or replace /vmlinuz.old: Is a directory at 
/usr/bin/linux-update-symlinks line 72.
 dpkg: error processing package linux-image-4.15.0-20-generic (--remove):
  installed linux-image-4.15.0-20-generic package post-removal script 
subprocess returned error exit status 21
ErrorMessage: installed linux-image-4.15.0-20-generic package post-removal 
script subprocess returned error exit status 21
InstallationDate: Installed on 2016-05-10 (748 days ago)
InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
Python3Details: /usr/bin/python3.6, Python 3.6.5, python3-minimal, 3.6.5-3
PythonDetails: /usr/bin/python2.7, Python 2.7.15rc1, python-minimal, 
2.7.15~rc1-1
RelatedPackageVersions:
 dpkg 1.19.0.5ubuntu2
 apt  1.6.1
SourcePackage: linux-signed
Title: package linux-image-4.15.0-20-generic 4.15.0-20.21 failed to 
install/upgrade: installed linux-image-4.15.0-20-generic package post-removal 
script subprocess returned error exit status 21
UpgradeStatus: Upgraded to bionic on 2018-05-05 (24 days ago)

** Affects: linux-signed (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-package bionic

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https://bugs.launchpad.net/bugs/1773990

Title:
  package linux-image-4.15.0-20-generic 4.15.0-20.21 failed to
  install/upgrade: installed linux-image-4.15.0-20-generic package post-
  removal script subprocess returned error exit status 21

Status in linux-signed package in Ubuntu:
  New

Bug description:
  Happened after upgrading to 18.04 from 16.04. Ubuntu fails to boot
  with kernel 4.15 as well.

  ProblemType: Package
  DistroRelease: Ubuntu 18.04
  Package: linux-image-4.15.0-20-generic 4.15.0-20.21
  ProcVersionSignature: Ubuntu 4.13.0-39.44-generic 4.13.16
  Uname: Linux 4.13.0-39-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7
  AptOrdering:
   linux-image-4.15.0-20-generic:amd64: Remove
   NULL: ConfigurePending
  Architecture: amd64
  Date: Tue May 29 16:12:20 2018
  DpkgTerminalLog:
   Removing linux-image-4.15.0-20-generic (4.15.0-20.21) ...
   Failed to create or replace /vmlinuz.old: Is a directory at 
/usr/bin/linux-update-symlinks line 72.
   dpkg: error processing package linux-image-4.15.0-20-generic (--remove):
    installed linux-image-4.15.0-20-generic package post-removal script 
subprocess returned error exit status 21
  DuplicateSignature:
   package:linux-image-4.15.0-20-generic:4.15.0-20.21
   Removing linux-image-4.15.0-20-generic (4.15.0-20.21) ...
   Failed to create or replace /vmlinuz.old: Is a directory at 
/usr/bin/linux-update-symlinks line 72.
   dpkg: error processing package linux-image-4.15.0-20-generic (--remove):
    installed linux-image-4.15.0-20-generic package post-removal script 
subprocess returned error exit status 21
  ErrorMessage: installed linux-image-4.15.0-20-generic package post-removal 
script subprocess returned error exit status 21
  InstallationDate: Installed on 2016-05-10 (748 days ago)
  InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 
(20160420.1)
  Python3Details: /usr/bin/python3.6, Python 3.6.5, python3-minimal, 3.6.5-3
  PythonDetails: /usr/bin/python2.7, Python 2.7.15rc1, python-minimal, 
2.7.15~rc1-1
  RelatedPackageVersions:
   dpkg 1.19.0.5ubuntu2
   apt  1.6.1
  SourcePackage: linux-signed
  Title: package linux-image-4.15.0-20-generic 4.15.0-20.21 failed to 
install/upgrade: installed linux-image-4.15.0-20-generic package post-removal 
script subprocess returned error exit status 21
  UpgradeStatus: Upgraded to bionic on 2018-05-05 (24 days ago)

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