No idea what happened there, but clearly not related to schooltool. Might be a defective CD drive, quick google found http://ubuntuforums.org/showthread.php?t=1664221 and there are more.
** Project changed: schooltool => ubuntu -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/882674 Title: EDD: Error 1000 reading sector (...) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+bug/882674/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
