Вот ещё помощь:

prerequists-sources.dapper-ports.list:deb http://ports.ubuntu.com/ubuntu-ports dapper-backports main/debian-installer
distro.py:            self, mirror_template="http://ftp.%s.debian.org/debian/")
distro.py:            self, mirror_template="http://%s.archive.ubuntu.com/ubuntu/")
DistUpgradeController.py:                        uri = "http://archive.ubuntu.com/ubuntu"
DistUpgradeController.py:                                         "http://security.ubuntu.com/ubuntu",
DistUpgradeController.py:                entry.uri.startswith("http://archive.canonical.com") and
DistUpgradeController.py:                entry.uri.startswith("http://landscape.canonical.com/packages/%s" % self.fromDist)):
DistUpgradeController.py:                for uri in ["http://%sarchive.ubuntu.com/ubuntu" % country_mirror(),
DistUpgradeController.py:                            "http://archive.ubuntu.com/ubuntu"]:
DistUpgradeController.py:                    entry.uri = "http://ports.ubuntu.com/ubuntu-ports/"
DistUpgradeController.py:                    uri = "http://archive.ubuntu.com/ubuntu"
DistUpgradeController.py:                    uri = "http://archive.ubuntu.com/ubuntu"
DistUpgradeController.py:                                     "http://security.ubuntu.com/ubuntu/",
DistUpgradeController.py:                                 "http://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgr... "
DistUpgradeController.py:        noCache = apt_pkg.config.find("Acquire::http::No-Cache","false")
DistUpgradeController.py:            apt_pkg.config.set("Acquire::http::No-Cache","true")
DistUpgradeController.py:        apt_pkg.config.set("Acquire::http::No-Cache",noCache)
DistUpgradeController.py:            #    deb http://localhost:9977/security.ubuntu.com/ubuntu intrepid-security main restricted
DistUpgradeController.py:                not entry.uri.startswith("http://security.ubuntu.com") and
DistUpgradeController.py:                not entry.uri.startswith("http://archive.ubuntu.com") ):