[Bug 1788647] Re: package mdadm 3.3-2ubuntu7.6 failed to install/upgrade: subprocess installed post-installation script returned error exit status 20

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** Tags removed: need-duplicate-check

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Title:
  package mdadm 3.3-2ubuntu7.6 failed to install/upgrade: subprocess
  installed post-installation script returned error exit status 20

Status in mdadm package in Ubuntu:
  New

Bug description:
  Unable to upgrade or reinstall mdadm

  ProblemType: Package
  DistroRelease: Ubuntu 16.04
  Package: mdadm 3.3-2ubuntu7.6
  ProcVersionSignature: Ubuntu 4.4.0-133.159-generic 4.4.134
  Uname: Linux 4.4.0-133-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.18
  Architecture: amd64
  Date: Thu Aug 23 23:33:15 2018
  DuplicateSignature:
   package:mdadm:3.3-2ubuntu7.6
   Setting up mdadm (3.3-2ubuntu7.6) ...
   dpkg: error processing package mdadm (--configure):
    subprocess installed post-installation script returned error exit status 20
  ErrorMessage: subprocess installed post-installation script returned error exit status 20
  InstallationDate: Installed on 2016-05-30 (815 days ago)
  InstallationMedia: Ubuntu-Server 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.3)
  MDadmExamine.dev.sda:
   /dev/sda:
      MBR Magic : aa55
   Partition[0] :     29294592 sectors at         2048 (type 83)
   Partition[1] :    205142018 sectors at     29298686 (type 05)
  MDadmExamine.dev.sda1: Error: command ['/sbin/mdadm', '-E', '/dev/sda1'] failed with exit code 1: mdadm: No md superblock detected on /dev/sda1.
  MDadmExamine.dev.sda2:
   /dev/sda2:
      MBR Magic : aa55
   Partition[0] :    197263360 sectors at            2 (type 83)
   Partition[1] :      7878656 sectors at    197263362 (type 05)
  MDadmExamine.dev.sda5: Error: command ['/sbin/mdadm', '-E', '/dev/sda5'] failed with exit code 1: mdadm: No md superblock detected on /dev/sda5.
  MDadmExamine.dev.sda6: Error: command ['/sbin/mdadm', '-E', '/dev/sda6'] failed with exit code 1: mdadm: No md superblock detected on /dev/sda6.
  MDadmExamine.dev.sdb:
   /dev/sdb:
      MBR Magic : aa55
   Partition[0] :   3907029167 sectors at            1 (type ee)
  MDadmExamine.dev.sdc:
   /dev/sdc:
      MBR Magic : aa55
   Partition[0] :   4294967295 sectors at            1 (type ee)
  MDadmExamine.dev.sdc2: Error: command ['/sbin/mdadm', '-E', '/dev/sdc2'] failed with exit code 1: mdadm: No md superblock detected on /dev/sdc2.
  MachineType: To Be Filled By O.E.M. To Be Filled By O.E.M.
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-133-generic root=UUID=b0849eae-81cb-4a51-95b4-f8f347bf7197 ro text
  RelatedPackageVersions:
   dpkg 1.18.4ubuntu1.4
   apt  1.2.27
  SourcePackage: mdadm
  Title: package mdadm 3.3-2ubuntu7.6 failed to install/upgrade: subprocess installed post-installation script returned error exit status 20
  UpgradeStatus: Upgraded to xenial on 2018-08-23 (0 days ago)
  dmi.bios.date: 04/29/2015
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: P1.50
  dmi.board.name: AM1H-ITX
  dmi.board.vendor: ASRock
  dmi.chassis.asset.tag: To Be Filled By O.E.M.
  dmi.chassis.type: 3
  dmi.chassis.vendor: To Be Filled By O.E.M.
  dmi.chassis.version: To Be Filled By O.E.M.
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrP1.50:bd04/29/2015:svnToBeFilledByO.E.M.:pnToBeFilledByO.E.M.:pvrToBeFilledByO.E.M.:rvnASRock:rnAM1H-ITX:rvr:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.:
  dmi.product.name: To Be Filled By O.E.M.
  dmi.product.version: To Be Filled By O.E.M.
  dmi.sys.vendor: To Be Filled By O.E.M.
  etc.blkid.tab: Error: [Errno 2] No such file or directory: '/etc/blkid.tab'

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