[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)

[Julian Andres Klode]

APT is not the cause of the issue (for some definition of cause). We
switched to running the fetcher processes as an unpriviliged user last
year in order to increase security. Client apps/directories need to be
adjusted for that to work.

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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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