[Bug 1522675] Re: Warning messages about unsandboxed downloads

[Rocdufer]

First, recall user _apt was added recently. Second, not all comments
appear to have the same original; some ones refer access rights, so some
comments suggest change owner or ACL of some directory. However, another
comments point out something that appears to be a parsing error over the
directory path. For example, in comment #94, the path:

 "W: Download is performed unsandboxed as root as file
'/root/.synaptic/tmp//tmp_cl' couldn't be accessed by user '_apt'. -
pkgAcquire::Run (13: Keine Berechtigung)"

looks quite extraneous, because it has an empty directory name at "/tmp/
/tmp_cl".  The error I got is quite similar, except it says "/tmp/
/tmp_sh", but in my system I later found directory .synaptic/tmp was
empty.

For the first problem, I do no see user _apt included in group sudo. And
for the second, I remember that while doing a system upgrade I was
notified about a change in MIME types. This could be a trace for a
parsing error. Hope this comment may help to solve the warning.

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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 apt package in Debian:
  Fix Released
Status in aptitude package in Debian:
  Fix Released
Status in synaptic package in Debian:
  New

Bug description:
  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 at 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 at 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 at 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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