[Bug 1522675] Re: Warning messages about unsandboxed downloads

[Travisgevans]

The command is lowercase “chown”, without the “(1)”. The general syntax
would be “chown <user name> <file or directory>”. You'll normally need
superuser privileges to change owners on system files and directories,
activated by adding the command “sudo” before the “chown” (separated by
a space).

The “(1)” refers to which section in the manual pages, or “manpages”,
the command is described in. A common way to get help on a command is to
run “man <command_name>”; for instance, you can execute “man chown” to
get the manpage on the chown command. (To exit, type the letter q; more
info here: https://help.ubuntu.com/community/man) The manual pages are
divided into numbered sections by categories. Occasionally, there is
more than one manpage with the same name, and the section number has to
be included in the “man” command to indicate which is desired (for
instance, “man 1 printf” gives the page on the shell command “printf”,
but “man 3 printf” gives the page on the “printf” library call for C
programming).

You can get a manpage on “man” itself with “man man” (or just read it
online here:
http://manpages.ubuntu.com/manpages/xenial/man1/man.1.html). Under
“DESCRIPTION”, there's a list of the manpage sections and their numbers,
if you're curious.

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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 update-notifier package in Ubuntu:
  Confirmed
Status in apt 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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