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[Launchpad Bug Tracker <1840956@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package qemu - 1:3.1+dfsg-2ubuntu3.5

---------------
qemu (1:3.1+dfsg-2ubuntu3.5) disco; urgency=medium

  * d/binfmt-update-in: fix binfmt usage in some containers (LP:
#1840956)

 -- Christian Ehrhardt <christian.ehrhardt@xxxxxxxxxxxxx>  Mon, 09 Sep
2019 10:59:15 +0200

** Changed in: qemu (Ubuntu Disco)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1840956

Title:
  qemu-user-static fails to install in WSL and LXD

Status in qemu package in Ubuntu:
  Fix Released
Status in qemu source package in Xenial:
  Confirmed
Status in qemu source package in Bionic:
  Won't Fix
Status in qemu source package in Disco:
  Fix Released

Bug description:
  [Impact]

   * The check in qemu postinst to nnot by accident run in a container 
     doesn't work in WSL. Due to that it tries to register bin_fmt types 
     which can't work in that environment.

   * Fix the check, so that it recognizes WSL (and probably a few other 
     containsers)

  [Test Case]

   * Install qemu-user-static in WSL(1) Ubuntu guest

  [Regression Potential]

   * The old check just detected LXD/LXC and any other container that put 
     the container into  /proc/1/environ. So we could now (on install) skip 
     bin_fmt registration on some containers where we did it before.
     Overall that is just what we wanted, but there could be containers set 
     up very privileged (uncommon) that would be able to do that before.
     Those would regress in a sense that it is not done on install.
     But the change would not prevent that in those (expected to be rare 
     cases) the user/admin registers the type later.

  [Other Info]
   
   * n/a

  ---

  Happened running do-release-upgrade from 18.04 to 18.10 on Windows
  Subsystem for Linux, Windows 10 1903. qemu-user-static can no longer
  be installed or run.

  ProblemType: Package
  DistroRelease: Ubuntu 19.04
  Package: qemu-user-static 1:3.1+dfsg-2ubuntu3.3
  ProcVersionSignature: Microsoft 4.4.0-18362.1-Microsoft 4.4.35
  Uname: Linux 4.4.0-18362-Microsoft x86_64
  ApportVersion: 2.20.10-0ubuntu27.1
  Architecture: amd64
  Date: Wed Aug 21 11:43:54 2019
  Dmesg: [    0.029344]  Microsoft 4.4.0-18362.1-Microsoft 4.4.35
  ErrorMessage: installed qemu-user-static package post-installation script subprocess returned error exit status 2
  Python3Details: /usr/bin/python3.7, Python 3.7.3, python3-minimal, 3.7.3-1
  PythonDetails: N/A
  RelatedPackageVersions:
   dpkg 1.19.6ubuntu1.1
   apt  1.8.1
  SourcePackage: qemu
  Title: package qemu-user-static 1:3.1+dfsg-2ubuntu3.3 failed to install/upgrade: installed qemu-user-static package post-installation script subprocess returned error exit status 2
  UpgradeStatus: Upgraded to disco on 2019-08-21 (0 days ago)
  mtime.conffile..etc.apport.crashdb.conf: 2019-08-09T13:43:51.502822

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