I: Upgrading for distribution sid
I: Building the build Environment
I: extracting base tarball [/TESTDIR/testimage]
I: creating local configuration
I: copying local configuration
I: Installing apt-lines
I: mounting /proc filesystem
I: mounting /dev/pts filesystem
I: policy-rc.d already exists
I: Refreshing the base.tgz 
I: upgrading packages
Get:1 http://localhost sid Release.gpg [835B]
Get:2 http://localhost sid Release [100kB]
Ign http://localhost sid/main Packages
Get:3 http://localhost sid/main Packages [7933kB]
Fetched XXXB in Xs (XXXXXB/s)
W: Failed to fetch http://localhost:9999/debian/dists/sid/main/binary-amd64/Packages.gz  Hash Sum mismatch

E: Some index files failed to download, they have been ignored, or old ones used instead.
I: unmounting dev/pts filesystem
I: unmounting proc filesystem
I: cleaning the build env 
I: removing directory /var/cache/pbuilder/build//NUM and its subdirectories