If ~/.pbuilderrc doesn't exist, /etc/pbuilderrc is used. And, I don't know which version of ubuntu-dev-tools it was, but in the current one pbuilder-dist does call pbuilder with --mirror.
If ~/.pbuilderrc doesn't exist, /etc/pbuilderrc is used.
And, I don't know which version of ubuntu-dev-tools it was, but in the current one pbuilder-dist does call pbuilder with --mirror.