[Bug 1130714] Re: apt doesn't handle multi-arched provides properly

[dino99]

** Tags added: i386 lts-backport raring

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Title:
  apt doesn't handle multi-arched provides properly

Status in “apt” package in Ubuntu:
  Confirmed

Bug description:
    affects ubuntu/apt
    subscribe jpugh
    subscribe dpitkin
    subscribe sarvatt
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  When installing steam:i386 in a fresh amd64 Ubuntu 12.04.2 installation, apt-get
  chooses to forcibly uninstall the entire X11 stack.

  The dependencies in question are:
   - steam:i386 depends on libgl1-mesa-{glx,dri}
   - libgl1-mesa-{glx,dri}-lts-quantal:amd64 are installed
   - libgl1-mesa-{glx,dri}-lts-quantal:i386 are not installed
   - libgl1-mesa-{glx,dri}:i386 are not installed.
   - libgl1-mesa-{glx,dri}-lts-quantal Provides: libgl1-mesa-{glx,dri}
   - libgl1-mesa-{glx,dri}-lts-quantal Conflicts: libgl1-mesa-{glx,dri}

  PROBLEM:
  Facing this situation, when apt-get is told to install steam:i386, it chooses to
  install libgl1-mesa-{glx,dri}:i386 instead of
  libgl1-mesa-{glx,dri}-lts-quantal:i386 (which can satisfy the dependency due to
  the Provides field being set appropriately). This forces
  libgl1-mesa-{glx,dri}:amd64 to be uninstalled due to the conflicts relationship
  as mentioned above.

  Conversely, if libgl1-mesa-{glx,dri}-lts-quantal:i386 is already installed,
  apt-get install steam:i386 does the right thing.

  Amending steam:i386 to depend on libgl1-mesa-{glx,dri}-lts-quantal |
  libgl1-mesa-{glx,dri}-lts-quantal fixes the issue for those with the LTS
  Enablement Stack installed, but causes this bug to manifest on systems on the
  older stack. Reversing the order of the packages in the bar dependency (foo |
  foo-lts-quantal) also doesn't work.

  
  [1] https://wiki.ubuntu.com/Kernel/LTSEnablementStack

  -- 
  Kind regards,
  Loong Jin

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