Comment 1 for bug 987329

This is an odd one. Looks like a sqlalchemy version incompatibility which would only be happening if you're installing the precise packaging onto previous a distro releases (natty, oneiric)

There are some Glance changes we're carrying in 12.04 packaging wrt database initialization and upgrades, please see mailing list post @ https://lists.launchpad.net/openstack/msg10090.html for an explanation