[Bug 1547984] [NEW] Downloading a package with root fails

[Sworddragon]

Public bug reported:

I'm using Ubuntu 16.04 dev with apt 1.2.3 and on downloading a package
with root I'm getting an error message like this example shows:

root at ubuntu:~/tmp# apt-get download nvidia-settings
Get:1 http://archive.ubuntu.com/ubuntu xenial/main amd64 nvidia-settings amd64 361.28-0ubuntu1 [856 kB]
Fetched 856 kB in 0s (1026 kB/s)         
W: Can't drop privileges for downloading as file '/root/tmp/nvidia-settings_361.28-0ubuntu1_amd64.deb' couldn't be accessed by user '_apt'. - pkgAcquire::Run (13: Permission denied)


The file gets created for root:root with the permissions 0644 and if I'm trying to download the file with my normal user it works successfully while also getting the same permissions.

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

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Title:
  Downloading a package with root fails

Status in apt package in Ubuntu:
  New

Bug description:
  I'm using Ubuntu 16.04 dev with apt 1.2.3 and on downloading a package
  with root I'm getting an error message like this example shows:

  root at ubuntu:~/tmp# apt-get download nvidia-settings
  Get:1 http://archive.ubuntu.com/ubuntu xenial/main amd64 nvidia-settings amd64 361.28-0ubuntu1 [856 kB]
  Fetched 856 kB in 0s (1026 kB/s)         
  W: Can't drop privileges for downloading as file '/root/tmp/nvidia-settings_361.28-0ubuntu1_amd64.deb' couldn't be accessed by user '_apt'. - pkgAcquire::Run (13: Permission denied)

  
  The file gets created for root:root with the permissions 0644 and if I'm trying to download the file with my normal user it works successfully while also getting the same permissions.

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