[Bug 1570141] Re: Can't drop privileges for downloading as file '/var/lib/update-notifier/package-data-downloads/partial/andale32.exe' couldn't be accessed by user '_apt'. - pkgAcquire::Run (13: Permission denied)

[Robert Pollak]

How is this related to bug #1537512?

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Title:
  Can't drop privileges for downloading as file '/var/lib/update-
  notifier/package-data-downloads/partial/andale32.exe' couldn't be
  accessed by user '_apt'. - pkgAcquire::Run (13: Permission denied)

Status in update-notifier package in Ubuntu:
  Confirmed

Bug description:
  ttf-mscorefonts-installer require additional download from external
  server (non deb package), but download not completed because have the
  error:

  Can't drop privileges for downloading as file '/var/lib/update-
  notifier/package-data-downloads/partial/andale32.exe' couldn't be
  accessed by user '_apt'. - pkgAcquire::Run (13: Permission denied)

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: update-notifier-common 3.168
  Uname: Linux 4.5.0-040500-generic x86_64
  NonfreeKernelModules: nvidia_uvm nvidia_modeset nvidia
  ApportVersion: 2.20.1-0ubuntu1
  Architecture: amd64
  Date: Wed Apr 13 20:45:36 2016
  ExecutablePath: /usr/lib/update-notifier/package-data-downloader
  InstallationDate: Installed on 2016-04-10 (3 days ago)
  InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Beta amd64 (20160408)
  InterpreterPath: /usr/bin/python3.5
  PackageArchitecture: all
  ProcEnviron:
   SHELL=/bin/bash
   TERM=xterm-256color
   PATH=(custom, no user)
   LANG=pt_BR.UTF-8
   LANGUAGE=pt_BR:pt:en
  SourcePackage: update-notifier
  UpgradeStatus: No upgrade log present (probably fresh install)

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