[Bug 1543280] Re: Synaptic fails with "W: Can't drop privileges for downloading as file '/root/.synaptic/tmp//tmp_sh' couldn't be accessed by user '_apt'. - pkgAcquire::Run (13: Permission denied)"

[sengerandu]

*** This bug is a duplicate of bug 1522675 ***
    https://bugs.launchpad.net/bugs/1522675

My plasma crashed repeatedly while searching for a program from the launcher menu. 
Plasma would recover each time with report that Baloo has failed to start. 
Restarted twice to see if it solves, no success.
Attempted to reinstall all Baloo related packages, when this "_apt" user issue is coming.

It is repeatable and persistent.

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https://bugs.launchpad.net/bugs/1543280

Title:
  Synaptic fails with "W: Can't drop privileges for downloading as file
  '/root/.synaptic/tmp//tmp_sh' couldn't be accessed by user '_apt'. -
  pkgAcquire::Run (13: Permission denied)"

Status in aptitude package in Ubuntu:
  Confirmed

Bug description:
  Fails on all sorts of Xenial package installs.

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

  Thanks.
  __________

  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
  ___________

  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.
  ___________

  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

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