Comment 8 for bug 1287943

Tested 0.12.4+bzr477-0ubuntu5 on precise (64 bits) did not work for me.
It stalls on:
....
2014-04-30 09:22:56,349 DEBUG : I: Configuring ubuntu-minimal...
2014-04-30 09:22:56,350 DEBUG : I: Configuring libc-bin...
2014-04-30 09:22:56,368 DEBUG : I: Configuring initramfs-tools...
2014-04-30 09:22:56,387 DEBUG : I: Base system installed successfully.
^CTraceback (most recent call last):
  File "/usr/bin/ubuntu-vm-builder", line 24, in <module>
    uvb.main()
  File "/usr/lib/python2.7/dist-packages/VMBuilder/contrib/cli.py", line 216, in main
    distro.build_chroot()
  File "/usr/lib/python2.7/dist-packages/VMBuilder/distro.py", line 83, in build_chroot
    self.call_hooks('bootstrap')
  File "/usr/lib/python2.7/dist-packages/VMBuilder/distro.py", line 67, in call_hooks
    call_hooks(self, *args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/VMBuilder/util.py", line 165, in call_hooks
    getattr(context, func, log_no_such_method)(*args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/VMBuilder/plugins/ubuntu/distro.py", line 136, in bootstrap
    self.suite.debootstrap()
  File "/usr/lib/python2.7/dist-packages/VMBuilder/plugins/ubuntu/dapper.py", line 269, in debootstrap
    run_cmd(*cmd, **kwargs)
  File "/usr/lib/python2.7/dist-packages/VMBuilder/util.py", line 113, in run_cmd
    fds = select.select([x.file for x in [mystdout, mystderr] if not x.closed], [], [])[0]
KeyboardInterrupt

ps ax shows:
5522 pts/2 S+ 0:00 /usr/bin/python /usr/bin/ubuntu-vm-builder kvm trusty --
 5524 pts/2 Z+ 0:00 [debootstrap] <defunct>

Building precise builds works ok.