[Bug 1606000] Re: package apt 1.2.12~ubuntu16.04.1 failed to install/upgrade: subprocess installed post-installation script returned error exit status 6

[Seth Arnold]

There's a lot of errors like this in the journal:

ul 24 09:12:59 hostname systemd[1]: systemd-udevd.service: Failed with result 'signal'.
jul 24 09:13:02 hostname systemd[1]: [/lib/systemd/system/emergency.service:19] Not an absolute path, ignoring: -/root
jul 24 09:13:02 hostname systemd[1]: [/lib/systemd/system/rescue.service:18] Not an absolute path, ignoring: -/root
jul 24 09:13:02 hostname systemd[1]: [/lib/systemd/system/user at .service:20] Unknown lvalue 'TasksMax' in section 'Service'
jul 24 09:13:02 hostname systemd[1]: tmp.mount: Cannot add dependency job, ignoring: Unit tmp.mount failed to load: No such file or directory.

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Title:
  package apt 1.2.12~ubuntu16.04.1 failed to install/upgrade: subprocess
  installed post-installation script returned error exit status 6

Status in apt package in Ubuntu:
  New
Status in systemd package in Ubuntu:
  New

Bug description:
  bug error

  ProblemType: Package
  DistroRelease: Ubuntu 16.04
  Package: apt 1.2.12~ubuntu16.04.1
  ProcVersionSignature: Ubuntu 4.2.0-42.49-generic 4.2.8-ckt12
  Uname: Linux 4.2.0-42-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.1
  Architecture: amd64
  Date: Sun Jul 24 09:52:56 2016
  ErrorMessage: subprocess installed post-installation script returned error exit status 6
  InstallationDate: Installed on 2015-09-20 (308 days ago)
  InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
  RelatedPackageVersions:
   dpkg 1.18.4ubuntu1.1
   apt  1.2.12~ubuntu16.04.1
  SourcePackage: apt
  Title: package apt 1.2.12~ubuntu16.04.1 failed to install/upgrade: subprocess installed post-installation script returned error exit status 6
  UpgradeStatus: Upgraded to xenial on 2016-07-24 (0 days ago)

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