[Bug 1748659] Re: Windows 10 Ubuntu 16.04 upgrade to 18.04: package systemd 235-3ubuntu3 failed to install/upgrade: installed systemd package post-installation script subprocess returned error exit status 1

[Patrick M. Womack]

I've gotten the release to upgrade to 18.04 on WSL, the issue I'm
running into however is that systemd will not reinstall. TBH WSL does
not require systemd to operate, but it defiantly makes the system angry
if it can't setup a way to manage startup. Just for anyone reading this
via google, if you want to push your WSL build to 18.04, DON'T. For
those of you who are ignoring my warning, you can push it to 18.04 BUT
YOU MUST HOLD SYSTEMD. If you try to run an upgrade and allow systemd to
be upgraded the upgrade will fail and you will be left with a completely
borked system. My thoughts at the moment is to try and grab a 16.04
systemd package and use that until we get a stable 18.04 one.

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Title:
  Windows 10 Ubuntu 16.04 upgrade to 18.04: package systemd 235-3ubuntu3
  failed to install/upgrade: installed systemd package post-installation
  script subprocess returned error exit status 1

Status in systemd package in Ubuntu:
  Confirmed

Bug description:
  This was fresh Ubuntu 16.04 instance on Windows 10, running inside a
  Virtual Box on an iMac. I did an apt-get dist-upgrade before
  attempting to upgrade to 18.04.

  ProblemType: Package
  DistroRelease: Ubuntu 16.04
  Package: systemd 235-3ubuntu3
  ProcVersionSignature: Microsoft 4.4.0-43-Microsoft 4.4.35
  Uname: Linux 4.4.0-43-Microsoft x86_64
  ApportVersion: 2.20.1-0ubuntu2.15
  Architecture: amd64
  CurrentDmesg: Error: command ['dmesg'] failed with exit code 1: dmesg: read kernel buffer failed: Function not implemented
  Date: Sat Feb 10 18:59:28 2018
  Dmesg:
   
  ErrorMessage: installed systemd package post-installation script subprocess returned error exit status 1
  Lsusb: Error: command ['lsusb'] failed with exit code 1:
  ProcInterrupts:
   
  ProcKernelCmdLine: BOOT_IMAGE=/kernel init=/init ro
  ProcModules: Error: command ['sort', '/proc/modules'] failed with exit code 2: sort: cannot read: /proc/modules: No such file or directory
  RelatedPackageVersions:
   dpkg 1.19.0.5ubuntu1
   apt  1.2.24
  SourcePackage: systemd
  SystemdDelta:
   [EXTENDED]   /lib/systemd/system/rc-local.service → /lib/systemd/system/rc-local.service.d/debian.conf
   [EXTENDED]   /lib/systemd/system/user at .service → /lib/systemd/system/user at .service.d/timeout.conf
   
   2 overridden configuration files found.
  Title: package systemd 235-3ubuntu3 failed to install/upgrade: installed systemd package post-installation script subprocess returned error exit status 1
  UpgradeStatus: Upgraded to xenial on 2018-02-10 (0 days ago)

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