[Bug 1527343] [NEW] the package libtbb2 can't be installed in 64 bit and 32 bit at the same time

[hen]

Public bug reported:

the package libtbb2 (64 bit) is installed on my system because some other packages depend on it (e.g. blender). I try to install the 32 bit version of libtbb2:
apt-get install libtbb2:i386

but this installation would uninstall libtbb2 (64 bit) and all packages
that depend on it (e.g. blender). So 32-bit Software that requires
libtbb2 (32-bit) can't be used or all packages that depend on libtbb2
(64 bit) have to be uninstalled. This behaviour isn't correct.

This happens on ubuntu 15.10 and on 14.04 too.

way to reproduce:
apt-get install libtbb2 libtbb2:i386

ProblemType: Bug
DistroRelease: Ubuntu 15.10
Package: dpkg 1.18.2ubuntu5.1
ProcVersionSignature: Ubuntu 4.2.0-19.23-generic 4.2.6
Uname: Linux 4.2.0-19-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.19.1-0ubuntu5
Architecture: amd64
CurrentDesktop: KDE
Date: Thu Dec 17 18:37:47 2015
InstallationDate: Installed on 2015-12-13 (3 days ago)
InstallationMedia: Kubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
SourcePackage: dpkg
UpgradeStatus: No upgrade log present (probably fresh install)

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


** Tags: amd64 apport-bug wily

** Description changed:

  the package libtbb2 (64 bit) is installed on my system because some other packages depend on it (e.g. blender). I try to install the 32 bit version of libtbb2:
- apt-get install  
+ apt-get install libtbb2:i386
  
  but this installation would uninstall libtbb2 (64 bit) and all packages
  that depend on it (e.g. blender). So 32-bit Software that requires
  libtbb2 (32-bit) can't be used or all packages that depend on libtbb2
  (64 bit) have to be uninstalled. This behaviour isn't correct.
  
  This happens on ubuntu 15.10 and on 14.04 too.
  
  way to reproduce:
  apt-get install libtbb2 libtbb2:i386
  
  ProblemType: Bug
  DistroRelease: Ubuntu 15.10
  Package: dpkg 1.18.2ubuntu5.1
  ProcVersionSignature: Ubuntu 4.2.0-19.23-generic 4.2.6
  Uname: Linux 4.2.0-19-generic x86_64
  NonfreeKernelModules: nvidia
  ApportVersion: 2.19.1-0ubuntu5
  Architecture: amd64
  CurrentDesktop: KDE
  Date: Thu Dec 17 18:37:47 2015
  InstallationDate: Installed on 2015-12-13 (3 days ago)
  InstallationMedia: Kubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
  SourcePackage: dpkg
  UpgradeStatus: No upgrade log present (probably fresh install)

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https://bugs.launchpad.net/bugs/1527343

Title:
  the package libtbb2 can't be installed in 64 bit and 32 bit at the
  same time

Status in dpkg package in Ubuntu:
  New

Bug description:
  the package libtbb2 (64 bit) is installed on my system because some other packages depend on it (e.g. blender). I try to install the 32 bit version of libtbb2:
  apt-get install libtbb2:i386

  but this installation would uninstall libtbb2 (64 bit) and all
  packages that depend on it (e.g. blender). So 32-bit Software that
  requires libtbb2 (32-bit) can't be used or all packages that depend on
  libtbb2 (64 bit) have to be uninstalled. This behaviour isn't correct.

  This happens on ubuntu 15.10 and on 14.04 too.

  way to reproduce:
  apt-get install libtbb2 libtbb2:i386

  ProblemType: Bug
  DistroRelease: Ubuntu 15.10
  Package: dpkg 1.18.2ubuntu5.1
  ProcVersionSignature: Ubuntu 4.2.0-19.23-generic 4.2.6
  Uname: Linux 4.2.0-19-generic x86_64
  NonfreeKernelModules: nvidia
  ApportVersion: 2.19.1-0ubuntu5
  Architecture: amd64
  CurrentDesktop: KDE
  Date: Thu Dec 17 18:37:47 2015
  InstallationDate: Installed on 2015-12-13 (3 days ago)
  InstallationMedia: Kubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
  SourcePackage: dpkg
  UpgradeStatus: No upgrade log present (probably fresh install)

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