The log file does indicate that there are errors with the media but perhaps it is in the CD / DVD drive?
If you are trying to downgrade from 11.10 to 11.04 this is an unsupported operation and it will actually fail as documented in bug 891711. If this is the case what state is your system in? -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/890738 Title: Downgrading ubuntu from v11.10 to v11.04 fails To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ubiquity/+bug/890738/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
