I just did this - I didn't have any Dapper repositories in my sources.list. I'm still getting the same result.
Here's my sources.list: deb http://us.archive.ubuntu.com/ubuntu/ edgy main restricted deb-src http://us.archive.ubuntu.com/ubuntu/ edgy main restricted # Ubuntu 'Universe' Repository deb http://archive.ubuntu.com/ubuntu/ edgy main restricted universe multiverse deb-src http://us.archive.ubuntu.com/ubuntu/ edgy universe main restricted multiverse # Ubuntu 'Backports' Repository deb http://us.archive.ubuntu.com/ubuntu/ edgy-backports main restricted universe multiverse deb-src http://us.archive.ubuntu.com/ubuntu/ edgy-backports main restricted universe multiverse # Ubuntu Security Updates deb http://security.ubuntu.com/ubuntu edgy-security main restricted deb-src http://security.ubuntu.com/ubuntu edgy-security main restricted deb http://security.ubuntu.com/ubuntu edgy-security universe deb-src http://security.ubuntu.com/ubuntu edgy-security universe -- slapd won't install in edgy https://launchpad.net/bugs/64088 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs