We worked that around by adding retries for apt-get operations with
exponential backoff and eventual abort after 6 retries (64s wait last
time). Of 51 instances which were launched since that fix was deployed,
18 had retries kick in. And 10 still failed in the end (i.e. after 6
retries). However, all failures were in "apt-get update", not "apt-get
install". The actual failures were like:

W: Failed to fetch http://us-
east-1.ec2.archive.ubuntu.com.s3.amazonaws.com/ubuntu/dists/natty-
updates/main/binary-amd64/Packages  403  Forbidden

In other words, we came back to same issue which we had with original
EC2 mirror - weird 403 errors. However, I'm still getting 403 on that
URL now, so maybe not all of those errors are really random, maybe
there's indeed permission problems, or 403 is misreported for absent
files or something.

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https://bugs.launchpad.net/bugs/932088

Title:
  Ubuntu EC2 package mirror intermitent failures

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