As I explained in bug 772365 which has been marked as duplicate of this one, this error is very likely due to a mirror being overloaded or failing to respond.
Alternatively it can also be caused by the use of an unofficial mirror. You can try again later, or use another mirror. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/772531 Title: 'ubuntu-minimal' cannot be found anymore while upgrading to Natty Narwhal -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
