[Bug 1543280] [NEW] apt-get fails withCan't drop privileges for downloading as file + couldn't be accessed by user '_apt'. - pkgAcquire::Run (13: Permission denied)

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Fails on all sorts of Xenial package installs.

Please update this ticket with manual fix for this, to facilitate Xenial
testing.

Thanks.
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Two simple examples...

1) aptitude changelog apt > /dev/null

2) echo 'ttf-mscorefonts-installer msttcorefonts/accepted-mscorefonts-eula select true' | debconf-set-selections
     apt-get -yqq install ttf-mscorefonts-installer
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There are several bugs related to this problem. None have a fix
specified + all are opened against random packages, rather than
aptitude.

Several of these bugs have been closed saying problem is fixed in apt-1.1.2 + above which is incorrect.
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lsb_release -a
No LSB modules are available.
Distributor ID:	Ubuntu
Description:	Ubuntu Xenial Xerus (development branch)
Release:	16.04
Codename:	xenial

apt-get --version
apt 1.1.10 (amd64)
Supported modules:
*Ver: Standard .deb
*Pkg:  Debian dpkg interface (Priority 30)
 Pkg:  Debian APT solver interface (Priority -1000)
 S.L: 'deb' Debian binary tree
 S.L: 'deb-src' Debian source tree
 Idx: Debian Source Index
 Idx: Debian Package Index
 Idx: Debian Translation Index
 Idx: Debian dpkg status file
 Idx: Debian deb file
 Idx: Debian dsc file
 Idx: Debian control file
 Idx: EDSP scenario file

aptitude --version
aptitude 0.7.4 compiled at Dec  9 2015 19:30:45
Compiler: g++ 5.3.1 20151207
Compiled against:
  apt version 5.0.0
  NCurses version 6.0
  libsigc++ version: 2.6.2
  Gtk+ support disabled.
  Qt support disabled.

Current library versions:
  NCurses version: ncurses 6.0.20151024
  cwidget version: 0.5.17
  Apt version: 5.0.0

** Affects: aptitude (Ubuntu)
     Importance: Undecided
         Status: New

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apt-get fails withCan't drop privileges for downloading as file + couldn't be accessed by user '_apt'. - pkgAcquire::Run (13: Permission denied)
https://bugs.launchpad.net/bugs/1543280
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