[Bug 1720348] [NEW] The key(s) in the keyring /etc/apt/trusted.gpg are ignored as the file is not readable by user '_apt' executing apt-key.

[Norbert]

Public bug reported:

Steps to reproduce:
1. Install Ubuntu 17.10
2. Install apt-file
3. Launch `sudo apt-file update`
4. Get normal output:

$ sudo apt-file update
Get:1 http://ru.archive.ubuntu.com/ubuntu artful InRelease [237 kB]
Hit:2 http://security.ubuntu.com/ubuntu artful-security InRelease              
Hit:3 http://archive.ubuntu.com/ubuntu artful InRelease                        
Hit:4 http://ru.archive.ubuntu.com/ubuntu artful-updates InRelease
Hit:5 http://ru.archive.ubuntu.com/ubuntu artful-backports InRelease
Fetched 237 kB in 5s (40,6 kB/s)
Reading package lists... Done
Building dependency tree       
Reading state information... Done
All packages are up to date.

and warning messages:

W: http://security.ubuntu.com/ubuntu/dists/artful-security/InRelease: The key(s) in the keyring /etc/apt/trusted.gpg are ignored as the file is not readable by user '_apt' executing apt-key.
W: http://archive.ubuntu.com/ubuntu/dists/artful/InRelease: The key(s) in the keyring /etc/apt/trusted.gpg are ignored as the file is not readable by user '_apt' executing apt-key.
W: http://ru.archive.ubuntu.com/ubuntu/dists/artful/InRelease: The key(s) in the keyring /etc/apt/trusted.gpg are ignored as the file is not readable by user '_apt' executing apt-key.
W: http://ru.archive.ubuntu.com/ubuntu/dists/artful-updates/InRelease: The key(s) in the keyring /etc/apt/trusted.gpg are ignored as the file is not readable by user '_apt' executing apt-key.
W: http://ru.archive.ubuntu.com/ubuntu/dists/artful-backports/InRelease: The key(s) in the keyring /etc/apt/trusted.gpg are ignored as the file is not readable by user '_apt' executing apt-key.

ProblemType: Bug
DistroRelease: Ubuntu 17.10
Package: apt 1.5
ProcVersionSignature: Ubuntu 4.13.0-12.13-generic 4.13.3
Uname: Linux 4.13.0-12-generic i686
ApportVersion: 2.20.7-0ubuntu1
Architecture: i386
CurrentDesktop: ubuntu:GNOME
Date: Fri Sep 29 15:05:04 2017
InstallationDate: Installed on 2017-08-26 (33 days ago)
InstallationMedia: Ubuntu 17.10 "Artful Aardvark" - Alpha i386 (20170826)
SourcePackage: apt
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: apt (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: apport-bug artful

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https://bugs.launchpad.net/bugs/1720348

Title:
  The key(s) in the keyring /etc/apt/trusted.gpg are ignored as the file
  is not readable by user '_apt' executing apt-key.

Status in apt package in Ubuntu:
  New

Bug description:
  Steps to reproduce:
  1. Install Ubuntu 17.10
  2. Install apt-file
  3. Launch `sudo apt-file update`
  4. Get normal output:

  $ sudo apt-file update
  Get:1 http://ru.archive.ubuntu.com/ubuntu artful InRelease [237 kB]
  Hit:2 http://security.ubuntu.com/ubuntu artful-security InRelease              
  Hit:3 http://archive.ubuntu.com/ubuntu artful InRelease                        
  Hit:4 http://ru.archive.ubuntu.com/ubuntu artful-updates InRelease
  Hit:5 http://ru.archive.ubuntu.com/ubuntu artful-backports InRelease
  Fetched 237 kB in 5s (40,6 kB/s)
  Reading package lists... Done
  Building dependency tree       
  Reading state information... Done
  All packages are up to date.

  and warning messages:

  W: http://security.ubuntu.com/ubuntu/dists/artful-security/InRelease: The key(s) in the keyring /etc/apt/trusted.gpg are ignored as the file is not readable by user '_apt' executing apt-key.
  W: http://archive.ubuntu.com/ubuntu/dists/artful/InRelease: The key(s) in the keyring /etc/apt/trusted.gpg are ignored as the file is not readable by user '_apt' executing apt-key.
  W: http://ru.archive.ubuntu.com/ubuntu/dists/artful/InRelease: The key(s) in the keyring /etc/apt/trusted.gpg are ignored as the file is not readable by user '_apt' executing apt-key.
  W: http://ru.archive.ubuntu.com/ubuntu/dists/artful-updates/InRelease: The key(s) in the keyring /etc/apt/trusted.gpg are ignored as the file is not readable by user '_apt' executing apt-key.
  W: http://ru.archive.ubuntu.com/ubuntu/dists/artful-backports/InRelease: The key(s) in the keyring /etc/apt/trusted.gpg are ignored as the file is not readable by user '_apt' executing apt-key.

  ProblemType: Bug
  DistroRelease: Ubuntu 17.10
  Package: apt 1.5
  ProcVersionSignature: Ubuntu 4.13.0-12.13-generic 4.13.3
  Uname: Linux 4.13.0-12-generic i686
  ApportVersion: 2.20.7-0ubuntu1
  Architecture: i386
  CurrentDesktop: ubuntu:GNOME
  Date: Fri Sep 29 15:05:04 2017
  InstallationDate: Installed on 2017-08-26 (33 days ago)
  InstallationMedia: Ubuntu 17.10 "Artful Aardvark" - Alpha i386 (20170826)
  SourcePackage: apt
  UpgradeStatus: No upgrade log present (probably fresh install)

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