Indeed. It may help to clean the CD/DVD, to burn the CD/DVD at a lower speed, or to clean the CD/DVD drive lens (cleaning kits are often available from electronics suppliers).
** Changed in: ubiquity (Ubuntu) Status: Needs Info => Rejected -- exit code -11 revealed to be a 'faulty disk' https://launchpad.net/bugs/67015 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs