[Bug 840048] [NEW] apt-get incorrectly prompts user to remove required i386 packages in multiarch environment

[Rocko]

Public bug reported:

I installed skype from the i386 deb package that I downloaded from the
Skype webpage (because apt-get install skype:i386 reported that the
package does not exist), and used apt-get -f install to install it and
its dependent i386 libraries. Now when I run apt-get, I get prompted
with:

The following packages were automatically installed and are no longer required:
  libkrb5-3:i386 libk5crypto3:i386 libstdc++6:i386 libqt4-declarative:i386
  liblcms1:i386 libqt4-script:i386 libqt4-network:i386 libqt4-dbus:i386
  libgnutls26:i386 libtasn1-3:i386 libfreetype6:i386 libexpat1:i386
  libqt4-xmlpatterns:i386 libavahi-common-data:i386 libxcb1:i386 libxau6:i386
  libcups2:i386 libqtcore4:i386 libkrb5support0:i386 libice6:i386
  libxdmcp6:i386 libgcrypt11:i386 libpostproc51 libkeyutils1:i386
  libqt4-sql:i386 libasound2:i386 libxrender1:i386 libqt4-xml:i386
  libxss1:i386 libtiff4:i386 libjpeg62:i386 libqtgui4:i386
  libavahi-client3:i386 libx11-6:i386 libfontconfig1:i386 libsm6:i386
  libgssapi-krb5-2:i386 libxi6:i386 libaudio2:i386 libxt6:i386 libxv1:i386
  libxext6:i386 libavahi-common3:i386 libmng1:i386 libgpg-error0:i386
Use 'apt-get autoremove' to remove them.

However, if I run apt-get autoremove, skype no longer works because of
course it depends on these packages.

I would expect apt-get to recognise the dependencies and not prompt me
to uninstall these packages.

ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: apt 0.8.16~exp5ubuntu6
Uname: Linux 3.1.0-rc4-git-20110831.1150 x86_64
NonfreeKernelModules: nvidia
Architecture: amd64
Date: Sat Sep  3 10:01:31 2011
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Beta amd64 (20110330)
SourcePackage: apt
UpgradeStatus: Upgraded to oneiric on 2011-09-02 (0 days ago)

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


** Tags: amd64 apport-bug oneiric running-unity

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https://bugs.launchpad.net/bugs/840048

Title:
  apt-get incorrectly prompts user to remove required i386 packages in
  multiarch environment

Status in “apt” package in Ubuntu:
  New

Bug description:
  I installed skype from the i386 deb package that I downloaded from the
  Skype webpage (because apt-get install skype:i386 reported that the
  package does not exist), and used apt-get -f install to install it and
  its dependent i386 libraries. Now when I run apt-get, I get prompted
  with:

  The following packages were automatically installed and are no longer required:
    libkrb5-3:i386 libk5crypto3:i386 libstdc++6:i386 libqt4-declarative:i386
    liblcms1:i386 libqt4-script:i386 libqt4-network:i386 libqt4-dbus:i386
    libgnutls26:i386 libtasn1-3:i386 libfreetype6:i386 libexpat1:i386
    libqt4-xmlpatterns:i386 libavahi-common-data:i386 libxcb1:i386 libxau6:i386
    libcups2:i386 libqtcore4:i386 libkrb5support0:i386 libice6:i386
    libxdmcp6:i386 libgcrypt11:i386 libpostproc51 libkeyutils1:i386
    libqt4-sql:i386 libasound2:i386 libxrender1:i386 libqt4-xml:i386
    libxss1:i386 libtiff4:i386 libjpeg62:i386 libqtgui4:i386
    libavahi-client3:i386 libx11-6:i386 libfontconfig1:i386 libsm6:i386
    libgssapi-krb5-2:i386 libxi6:i386 libaudio2:i386 libxt6:i386 libxv1:i386
    libxext6:i386 libavahi-common3:i386 libmng1:i386 libgpg-error0:i386
  Use 'apt-get autoremove' to remove them.

  However, if I run apt-get autoremove, skype no longer works because of
  course it depends on these packages.

  I would expect apt-get to recognise the dependencies and not prompt me
  to uninstall these packages.

  ProblemType: Bug
  DistroRelease: Ubuntu 11.10
  Package: apt 0.8.16~exp5ubuntu6
  Uname: Linux 3.1.0-rc4-git-20110831.1150 x86_64
  NonfreeKernelModules: nvidia
  Architecture: amd64
  Date: Sat Sep  3 10:01:31 2011
  InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Beta amd64 (20110330)
  SourcePackage: apt
  UpgradeStatus: Upgraded to oneiric on 2011-09-02 (0 days ago)

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