@Tommy do-release-upgrade downloads an upgrade file which does some
things that can't be done in the actual packages (install upgrade
prerequisites, purging packages, fixing proprietary xorg drivers etc.)
You can see the DistUpgrade.cfg script for Precise at
http://archive.ubuntu.com/ubuntu/dists/precise/main/dist-upgrader-
all/current/precise.tar.gz

If you want to complete the upgrade with do-release-upgrade rather than
dist-upgrade, just make sure apt is upgraded first:

sed 's/oneiric/precise/g' -i /etc/apt/sources.list
apt-get update
apt-get install apt python-apt
sed 's/precise/oneiric/g' -i /etc/apt/sources.list
do-release-upgrade

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https://bugs.launchpad.net/bugs/924079

Title:
  do-release-upgrade fails to upgrade from Oneiric to Precise

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