Comment 14 for bug 948461

Regarding comment #13, I think the concern is moot right now. I was able to replicate the issue with "-o=Acquire::http::Pipeline-Depth=0" turned on. Which means that pipelining may contribute but doesn't appear to be the sole cause.

Failed to fetch http://us-east-1.ec2.archive.ubuntu.com.s3.amazonaws.com/ubuntu/pool/main/libx/libxinerama/libxinerama1_1.1.1-3build1_amd64.deb Size mismatch
Failed to fetch http://us-east-1.ec2.archive.ubuntu.com.s3.amazonaws.com/ubuntu/pool/main/libx/libxrandr/libxrandr2_1.3.2-2_amd64.deb Size mismatch
Failed to fetch http://us-east-1.ec2.archive.ubuntu.com.s3.amazonaws.com/ubuntu/pool/main/s/shared-mime-info/shared-mime-info_1.0-0ubuntu1_amd64.deb Size mismatch
Failed to fetch http://us-east-1.ec2.archive.ubuntu.com.s3.amazonaws.com/ubuntu/pool/main/g/gtk+2.0/libgtk2.0-0_2.24.10-0ubuntu5_amd64.deb Size mismatch
Failed to fetch http://us-east-1.ec2.archive.ubuntu.com.s3.amazonaws.com/ubuntu/pool/main/x/xorg/x11-common_7.6+10ubuntu1_all.deb Size mismatch
Failed to fetch http://us-east-1.ec2.archive.ubuntu.com.s3.amazonaws.com/ubuntu/pool/main/libi/libice/libice6_1.0.7-2build1_amd64.deb Size mismatch
Failed to fetch http://us-east-1.ec2.archive.ubuntu.com.s3.amazonaws.com/ubuntu/pool/main/p/policykit-1/libpolkit-agent-1-0_0.104-1_amd64.deb Size mismatch
Fetched 28.1 MB in 8s (3,261 kB/s)
E: Some files failed to download

root@ip-10-80-113-210:/var/cache/apt/archives/partial# dpkg -I libxinerama1_2%3a1.1.1-3build1_amd64.deb
 new debian package, version 2.0.
 size 456104 bytes: control archive= 1639 bytes.
     805 bytes, 18 lines control
    1330 bytes, 16 lines md5sums
     479 bytes, 20 lines * postinst #!/bin/sh
     376 bytes, 19 lines * postrm #!/bin/sh
     194 bytes, 14 lines * prerm #!/bin/sh
      34 bytes, 1 lines triggers
 Package: shared-mime-info
 Version: 1.0-0ubuntu1
 Architecture: amd64
 Maintainer: Ubuntu Developers <email address hidden>
 Installed-Size: 2188
 Depends: libc6 (>= 2.3), libglib2.0-0 (>= 2.24.0), libxml2 (>= 2.7.4)
 Conflicts: libglib2.0-0 (<< 2.17.2), libgnomevfs2-0 (<< 1:2.24.0), tracker (<< 0.6.90)
 Section: misc
 Priority: optional
 Multi-Arch: foreign
 Homepage: http://freedesktop.org/wiki/Software/shared-mime-info
 Description: FreeDesktop.org shared MIME database and spec
  This is the shared MIME-info database from the X Desktop Group. It is required
  by any program complying to the Shared MIME-Info Database spec, which is also
  included in this package.
  At this time at least ROX, GNOME, KDE and XFCE use this database.
 Original-Maintainer: Sebastian Dröge <email address hidden>