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[Launchpad Bug Tracker <1522675@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package update-notifier - 3.168.8

---------------
update-notifier (3.168.8) xenial; urgency=medium

  * Fix APT sandboxing for data downloads failing (LP: #1522675)

 -- Julian Andres Klode <juliank@xxxxxxxxxx>  Fri, 02 Mar 2018 12:27:35
+0100

** Changed in: update-notifier (Ubuntu Xenial)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1522675

Title:
  Warning messages about unsandboxed downloads

Status in apt package in Ubuntu:
  Fix Released
Status in aptitude package in Ubuntu:
  Fix Released
Status in synaptic package in Ubuntu:
  Triaged
Status in update-notifier package in Ubuntu:
  Fix Released
Status in aptitude source package in Xenial:
  Confirmed
Status in synaptic source package in Xenial:
  Confirmed
Status in update-notifier source package in Xenial:
  Fix Released
Status in apt package in Debian:
  Fix Released
Status in aptitude package in Debian:
  Fix Released
Status in synaptic package in Debian:
  New

Bug description:
  READ ME FIRST
  =============
  This is a cosmetic issue. The warning message is just that— a warning. Though the message comes up, there is no problem with the install/upgrade happening like normal. That said, feel free to ignore it. It will get fixed, but it's nowhere near as urgent as bugs that actually result in the wrong behavior rather than just a simple extra message.

  update-notifier SRU
  -------------------
  [Impact]
  Cosmetic. Warnings when installing packages using update-notifier downloading stuff

  [Test case]

  Install flashplugin-installer with apt and check that the output does
  not contain a message like this:

  W: Can't drop privileges for downloading as file '...' couldn't be
  accessed by user '_apt'

  [Regression Potential]

  It just chowns /var/lib/update-notifier/package-data-
  downloads/partial/ to _apt:root, there should not be any regression.

  Original report
  ---------------

  Recently we got new versions for synaptic 0.82+build1 & apt 1.1.3, but
  now get that error when installing/upgrading some packages:

  Setting up libc6-dbg:amd64 (2.21-0ubuntu5) ...
  Processing triggers for libc-bin (2.21-0ubuntu5) ...
  W: Can't drop privileges for downloading as file '/root/.synaptic/tmp//tmp_cl' couldn't be accessed by user '_apt'. - pkgAcquire::Run (13: Permission denied)

  From nautilus, i'm seeing a /root/ folder locked (x on its icon) and
  the folder is empty (no /.synaptic/ sub-folder or file), so the above
  error.

  oem@u64:~$ ls -l .synaptic
  total 4
  -rw-rw-r-- 1 oem oem   0 Aug 25 11:19 options
  -rw-rw-r-- 1 oem oem 236 Aug 25 11:19 synaptic.conf

  oem@u64:~$ ls -l /var/lib/apt/lists/
  ....
  -rw-r----- 1 root root        0 Sep 20 06:36 lock
  drwx------ 2 _apt root    16384 Sep 24 15:25 partial
  ......

  oem@u64:~$ sudo ls -l /var/lib/update-notifier/package-data-downloads/
  .....
  drwxr-xr-x 2 _apt root 4096 Sep 22 23:33 partial

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: synaptic 0.82+build1
  ProcVersionSignature: Ubuntu 4.3.0-1.10-generic 4.3.0
  Uname: Linux 4.3.0-1-generic x86_64
  NonfreeKernelModules: nvidia
  ApportVersion: 2.19.2-0ubuntu8
  Architecture: amd64
  CurrentDesktop: GNOME
  Date: Fri Dec  4 05:23:25 2015
  SourcePackage: synaptic
  UpgradeStatus: No upgrade log present (probably fresh install)

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