This turns out to be more a bug in pbuilder: The _original_ /etc/pbuilderrc which is generated by apt-get install pbuilder contains: MIRRORSITE=http://ftp.jp.debian.org/debian so that my previous tries had no chance to go right.
The same config file on another Ubuntu EDGY PC has a correct MIRRORSITE setting. So the pbuilder should take a correct Ubuntu setting with it. Thanks, Achim -- prevu-init on Breezy goes wrong https://launchpad.net/bugs/85166 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs