Installing Ubuntu 11.10 fails with error message

[blue balls]

  I tried installing Kubuntu 11.10 with the alternate install CD.

 Everything went well at first including detecting and partitioning the hard disks.
 After that I received the following error message:

    No installable kernel was found in the defined APT sources.

  I continued without the kernel but later, during the installation of the base system, another error message appeared and that step failed too.
  I tried going back several times, but nothing changed.
  Basically I couldn't install Kubuntu 11.10 from the alternate CD.

[blue balls (blueballs5432)]

  I saved the install logs. Here is the syslog, maybe it could be used to debug the problem.

  Let me know if you want some of the others.

[Ubuntu Foundations Team Bug Bot (crichton)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. It seems that your bug report is not filed about a specific source package though, rather it is just filed against Ubuntu in general. It is important that bug reports be filed about source packages so that people interested in the package can find the bugs about it. You can find some hints about determining what package your bug might be about at https://wiki.ubuntu.com/Bugs/FindRightPackage. You might also ask for help in the #ubuntu-bugs irc channel on Freenode.

To change the source package that this bug is filed about visit https://bugs.launchpad.net/ubuntu/+bug/947905/+editstatus and add the package name in the text box next to the word Package.

[This is an automated message. I apologize if it reached you inappropriately; please just reply to this message indicating so.]

[blue balls (blueballs5432)]

   There is no individual package concerned since this bug concerns the Ubuntu installer, specifically the alternate CD installer.

[Marcus Tomlinson (marcustomlinson)]

This release of Ubuntu is no longer receiving maintenance updates. If this is still an issue on a maintained version of Ubuntu please let us know.

[Launchpad Janitor (janitor)]

[Expired for ubiquity (Ubuntu) because there has been no activity for 60 days.]