Having the same issue (same log data for us.archive.ubuntu.com with Trusty) as 
the OP with MAAS, I executed:
sed -i '@s@mirror@choose-mirror@g' /etc/maas/preseeds/generic

which resolved the issue.

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https://bugs.launchpad.net/bugs/600789

Title:
  "d-i mirror/*" does not work on presseding

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