Comment 61 for bug 587186

I'm showing my ignorance of installation internals I guess, but will a libc6 preinst script that prevents an upgrade cause upgrade-manager to roll everything back to the previous release(i.e. it looks to me like by the time you've downloaded the upgrades so you can get to the preinst script, apt has been set to the new release - will the preinst 'failing' cause apt settings to be rolled back)?