[Bug 1547984] Re: Downloading a package with root warns

[Fabio C. Barrionuevo]

same cause of this bugs:

https://bugs.launchpad.net/ubuntu/+source/update-notifier/+bug/1570141
https://bugs.launchpad.net/ubuntu/+source/pepperflashplugin-nonfree/+bug/1551511

I install a new ppa and run apt-get update and get this error:

W: Can't drop privileges for downloading as file
'/var/lib/apt/lists/partial/archive.ubuntu.com_ubuntu_dists_xenial_InRelease'
couldn't be accessed by user '_apt'. - pkgAcquire::Run (13: Permissão
negada)


I am using Ubuntu 16.0 Beta Final, with all the updated packages

The permissions:

fabio at luzfcb:~$ ls -dl /var/cache/apt/archives/partial/ 
drwx------ 2 _apt root 4096 Abr 11 21:13 /var/cache/apt/archives/partial/

fabio at luzfcb:~$ ls -dl /var/cache/apt/archives/
drwxr-xr-x 4 root root 28672 Abr 13 19:57 /var/cache/apt/archives/

fabio at luzfcb:~$ grep -B2 _apt /var/lib/dpkg/info/apt.postinst 
	# add unprivileged user for the apt methods
	adduser --force-badname --system --home /nonexistent  \
	    --no-create-home --quiet _apt || true

	# Fixup any mistake in the home directory of the _apt user
	if dpkg --compare-versions "$2" lt-nl 1.1~exp10~; then
	    usermod --home /nonexistent _apt


fabio at luzfcb:~$ sudo apt-get update 
Atingido:1 http://repo.steampowered.com/steam precise InRelease                
Obter:2 http://archive.ubuntu.com/ubuntu xenial InRelease [247 kB]             
Ign:3 http://dl.google.com/linux/chrome/deb stable InRelease                   
Atingido:5 http://archive.canonical.com/ubuntu xenial InRelease                
Atingido:6 http://apt.postgresql.org/pub/repos/apt xenial-pgdg InRelease       
Atingido:7 http://dl.google.com/linux/chrome/deb stable Release                
Atingido:9 http://ppa.launchpad.net/gregory-hainaut/pcsx2.official.ppa/ubuntu xenial InRelease
Atingido:10 http://ppa.launchpad.net/gwendal-lebihan-dev/hexchat-stable/ubuntu xenial InRelease
Atingido:11 http://ppa.launchpad.net/indicator-brightness/ppa/ubuntu xenial InRelease
Ign:4 http://toolbelt.heroku.com/ubuntu ./ InRelease                           
Atingido:12 http://ppa.launchpad.net/maarten-baert/simplescreenrecorder/ubuntu xenial InRelease
Atingido:14 http://ppa.launchpad.net/saiarcot895/myppa/ubuntu xenial InRelease 
Obter:15 http://ppa.launchpad.net/webupd8team/java/ubuntu xenial InRelease [17,5 kB]
Atingido:13 http://toolbelt.heroku.com/ubuntu ./ Release                       
Obter:17 http://ppa.launchpad.net/webupd8team/java/ubuntu xenial/main amd64 Packages [2.840 B]
Atingido:18 http://archive.ubuntu.com/ubuntu xenial-updates InRelease          
Obter:19 http://ppa.launchpad.net/webupd8team/java/ubuntu xenial/main i386 Packages [2.840 B]
Obter:20 http://ppa.launchpad.net/webupd8team/java/ubuntu xenial/main Translation-en [1.260 B]
Atingido:21 http://archive.ubuntu.com/ubuntu xenial-backports InRelease        
Atingido:22 http://archive.ubuntu.com/ubuntu xenial-security InRelease         
Obter:23 http://archive.ubuntu.com/ubuntu xenial/main amd64 Packages [1.184 kB]
Obter:24 http://archive.ubuntu.com/ubuntu xenial/main i386 Packages [1.179 kB] 
Obter:25 http://archive.ubuntu.com/ubuntu xenial/main amd64 DEP-11 Metadata [635 kB]
Obter:26 http://archive.ubuntu.com/ubuntu xenial/main DEP-11 64x64 Icons [404 kB]
Obter:27 http://archive.ubuntu.com/ubuntu xenial/universe amd64 Packages [7.543 kB]
Obter:28 http://archive.ubuntu.com/ubuntu xenial/universe i386 Packages [7.524 kB]
Obter:29 http://archive.ubuntu.com/ubuntu xenial/universe Translation-en [4.361 kB]
Obter:30 http://archive.ubuntu.com/ubuntu xenial/universe amd64 DEP-11 Metadata [1.846 kB]
Obter:31 http://archive.ubuntu.com/ubuntu xenial/universe DEP-11 64x64 Icons [7.482 kB]
Baixados 32,4 MB em 2min 19s (233 kB/s)                                        
AppStream cache update completed, but some metadata was ignored due to errors.
Lendo listas de pacotes... Pronto
W: Can't drop privileges for downloading as file '/var/lib/apt/lists/partial/archive.ubuntu.com_ubuntu_dists_xenial_InRelease' couldn't be accessed by user '_apt'. - pkgAcquire::Run (13: Permissão negada)
W: http://dl.google.com/linux/chrome/deb/dists/stable/Release.gpg: Signature by key 4CCA1EAF950CEE4AB83976DCA040830F7FAC5991 uses weak digest algorithm (SHA1)
W: http://toolbelt.heroku.com/ubuntu/./Release.gpg: Signature by key 150C6249147592DE6D91981CC927EBE00F1B0520 uses weak digest algorithm (SHA1)

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https://bugs.launchpad.net/bugs/1547984

Title:
  Downloading a package with root warns

Status in apt package in Ubuntu:
  Confirmed

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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