[Bug 1928615] Re: package tzdata 2021a-0ubuntu0.20.04 failed to install/upgrade: installed tzdata package post-installation script subprocess returned error exit status 12

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** Tags removed: need-duplicate-check

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Title:
  package tzdata 2021a-0ubuntu0.20.04 failed to install/upgrade:
  installed tzdata package post-installation script subprocess returned
  error exit status 12

Status in tzdata package in Ubuntu:
  New

Bug description:
  happened during do-release-upgrade

  ProblemType: Package
  DistroRelease: Ubuntu 20.04
  Package: tzdata 2021a-0ubuntu0.20.04
  ProcVersionSignature: Ubuntu 4.15.0-143.147-generic 4.15.18
  Uname: Linux 4.15.0-143-generic x86_64
  ApportVersion: 2.20.11-0ubuntu27.17
  Architecture: amd64
  CasperMD5CheckResult: skip
  Date: Sun May 16 17:07:53 2021
  DuplicateSignature:
   package:tzdata:2021a-0ubuntu0.20.04
   Setting up tzdata (2021a-0ubuntu0.20.04) ...
   open2: fork failed: Cannot allocate memory at /usr/share/perl5/Debconf/ConfModule.pm line 59.
   dpkg: error processing package tzdata (--configure):
    installed tzdata package post-installation script subprocess returned error exit status 12
  ErrorMessage: installed tzdata package post-installation script subprocess returned error exit status 12
  InstallationDate: Installed on 2018-05-18 (1094 days ago)
  InstallationMedia: Ubuntu-Server 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
  PackageArchitecture: all
  Python3Details: /usr/bin/python3.8, Python 3.8.5, python3-minimal, 3.8.2-0ubuntu2
  PythonDetails: /usr/bin/python2.7, Python 2.7.18, python-is-python2, 2.7.17-4
  RelatedPackageVersions:
   dpkg 1.19.7ubuntu3
   apt  2.0.5
  SourcePackage: tzdata
  Title: package tzdata 2021a-0ubuntu0.20.04 failed to install/upgrade: installed tzdata package post-installation script subprocess returned error exit status 12
  UpgradeStatus: Upgraded to focal on 2021-05-17 (0 days ago)

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