Where is the gitian-builder config that specifies the LXC container user?

Question

Debian

I remember seeing it somewhere, but I can't find it. All shoveled already.

--- Building for wheezy amd64 ---
Stopping target if it is up
Making a new image copy
sudo: unable to resolve host gitian
stdin: is not a tty
Reading package lists... Done
Building dependency tree... Done
The following packages will be REMOVED:
  rsyslog
0 upgraded, 0 newly installed, 1 to remove and 0 not upgraded.
After this operation, 1335 kB disk space will be freed.
(Reading database ... 16101 files and directories currently installed.)
Removing rsyslog ...
Stopping enhanced syslogd: rsyslogd already stopped.
Processing triggers for man-db ...
debconf: unable to initialize frontend: Dialog
debconf: (Dialog frontend will not work on a dumb terminal, an emacs shell buffer, or without a controlling terminal.)
debconf: falling back to frontend: Readline
Adding 'local diversion of /sbin/initctl to /sbin/initctl.distrib'
Adding 'local diversion of /usr/bin/ischroot to /usr/bin/ischroot.distrib'
Adding 'local diversion of /usr/sbin/policy-rc.d to /usr/sbin/policy-rc.d.distrib'
Starting target
Checking if target is up..............................
sudo: unknown user: ubuntu
sudo: unable to initialize policy plugin
bin/gbuild:21:in `system!': failed to run on-target true (RuntimeError)
        from bin/gbuild:73:in `build_one_configuration'
        from bin/gbuild:285:in `block (2 levels) in <main>'
        from bin/gbuild:280:in `each'
        from bin/gbuild:280:in `block in <main>'
        from bin/gbuild:278:in `each'
        from bin/gbuild:278:in `<main>'