[Bug 1752907] Re: `aptitude changelog apt` results in W: chmod 0700 of directory failed - SetupAPTPartialDirectory (1: Operation not permitted)

[Norbert]

** Changed in: aptitude (Ubuntu)
       Status: New => Fix Released

** Tags removed: xenial

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Title:
  `aptitude changelog apt` results in W: chmod 0700 of directory failed
  - SetupAPTPartialDirectory  (1: Operation not permitted)

Status in aptitude package in Ubuntu:
  Fix Released

Bug description:
  Steps to reproduce:
  1. Install Ubuntu 16.04 LTS
  2. Install aptitude
  3.1. Try to get changelog of the package:
  $ aptitude changelog aptitude
  3.1. Launch aptitude interactively with `sudo aptitude`, select package and click <C>

  Expected results:
  * changelog is shown, no errors or warning messages shown

  Actual results:
  a. changelog and warning message are shown:

  $ aptitude changelog aptitude
  Get: Changelog of aptitude
  W: chmod 0700 of directory /var/lib/apt/lists/partial failed - SetupAPTPartialDirectory (1: Operation not permitted)
  W: chmod 0700 of directory /var/cache/apt/archives/partial failed - SetupAPTPartialDirectory (1: Operation not permitted)

  b. got warning "window" with text:

  W: Can't drop privileges for downloading as file '/tmp/aptitude-root.13632:1pMX1q/aptitudeDownload6J+8J:+PsVGmTNm^.^::Lz:%.Hi55VKA' couldn't be
  accessed by user '_apt'. - pkgAcquire::Run (13: Permission denied)

  then read changelog.

  Notes:
  1. Directory rights are as follows:

  $ sudo ls -ald /var/lib/apt/lists/partial /var/cache/apt/archives/partial
  drwx------ 2 _apt root  4096 мар  2 18:18 /var/cache/apt/archives/partial
  drwx------ 2 _apt root 24576 мар  2 18:22 /var/lib/apt/lists/partial

  
  2. Ubuntu 14.04 LTS, 17.10 and 18.04 LTS are not affected by this bug.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: aptitude 0.7.4-2ubuntu2
  ProcVersionSignature: Ubuntu 4.4.0-116.140-generic 4.4.98
  Uname: Linux 4.4.0-116-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.15
  Architecture: amd64
  CurrentDesktop: MATE
  Date: Fri Mar  2 18:22:18 2018
  InstallationDate: Installed on 2018-01-04 (56 days ago)
  InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
  SourcePackage: aptitude
  UpgradeStatus: No upgrade log present (probably fresh install)

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