[Bug 1718453] Re: apt does not download dep11 files for foreign architectures and appstream cannot find applications for these archs.

[Matthias Klumpp]

@donkult: The downloads for all architectures are not allowed at time,
because doing so would lead to AppStream-ID collisions, and AppStream
itself has no notion of architectures (yet - I played around with that a
bit, but there is no definitive good solution yet).

For downloading Components-all, if we would generate such a file, could
APT be configured to download that one unconditionally, no matter what
the Releases file says? Because in that case, we could do quite a few
optimizations to save disk space.

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Title:
  apt does not download dep11 files for foreign architectures and
  appstream cannot find applications for these archs.

Status in appstream package in Ubuntu:
  Confirmed
Status in apt package in Ubuntu:
  Invalid

Bug description:
  I noticed the following community member had a problem installing
  steam. I reproduced it on 16.04.3 clean install i386 and amd64.

  https://www.youtube.com/watch?v=24NH3Ry22Dg

  Install 16.04 amd64 or i386
  Install all updates via software updater
  Open Ubuntu Software
  Search for steam.

  No results for Steam found.
  Yet steam is in the repository as an i386 deb - but it doesn't show up in Ubuntu Software on either amd64 or i386 installs.

  
  Also discussed at https://ubuntu.labix.org/t/ubuntu-software-deb-install-issues/81

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: gnome-software 3.20.5-0ubuntu0.16.04.5
  ProcVersionSignature: Ubuntu 4.10.0-35.39~16.04.1-generic 4.10.17
  Uname: Linux 4.10.0-35-generic i686
  ApportVersion: 2.20.1-0ubuntu2.10
  Architecture: i386
  CurrentDesktop: Unity
  Date: Wed Sep 20 15:46:02 2017
  InstallationDate: Installed on 2017-09-20 (0 days ago)
  InstallationMedia: Ubuntu 16.04.3 LTS "Xenial Xerus" - Release i386 (20170801)
  SourcePackage: gnome-software
  UpgradeStatus: No upgrade log present (probably fresh install)

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