VMBUILDER - KVM - Lucid virtuális gép létrehozása - HIBA!

Ubuntu 11.04 host gépen próbálok létrehozni egy lucid virtuális gépet de nem sikerül. Másnak megy? Nem értem mert korábban sikerült, de most nem. Ötlet?

ubuntu-vm-builder kvm lucid --arch 'amd64' --cpus=2 --mem '2048' --rootsize '10240' --swapsize '1024' --kernel-flavour 'virtual' --dest 'template' --hostname 'template' --mirror 'http://hu.archive.ubuntu.com/ubuntu' --components 'main,universe,multiverse' --addpkg 'vim-nox,openssh-server,acpid' --name 'name' --user 'user' --pass 'pass' --ip '192.168.17.200' --net '192.168.17.0' --mask '255.255.255.0' --bcast '192.168.17.255' --gw '192.168.17.254' --dns '192.168.17.1 192.168.17.2' --libvirt 'qemu:///system' --bridge=br0.
.
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2012-03-19 13:51:16,849 INFO : umount: /tmp/tmpSeDNMb/dev: device is busy.
2012-03-19 13:51:16,850 INFO : (In some cases useful info about processes that use
2012-03-19 13:51:16,850 INFO : the device is found by lsof(8) or fuser(1))
2012-03-19 13:51:16,850 INFO : Cleaning up
2012-03-19 13:51:16,850 ERROR : Process (['umount', '/tmp/tmpSeDNMb/dev']) returned 1. stdout: , stderr: umount: /tmp/tmpSeDNMb/dev: device is busy.
(In some cases useful info about processes that use
the device is found by lsof(8) or fuser(1))

Traceback (most recent call last):
File "/usr/bin/ubuntu-vm-builder", line 24, in
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 84, in build_chroot
self.call_hooks('configure_os')
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 155, in configure_os
self.suite.unmount_dev()
File "/usr/lib/python2.7/dist-packages/VMBuilder/plugins/ubuntu/dapper.py", line 118, in unmount_dev
run_cmd('umount', '%s/dev' % self.context.chroot_dir)
File "/usr/lib/python2.7/dist-packages/VMBuilder/util.py", line 120, in run_cmd
raise VMBuilderException, "Process (%s) returned %d. stdout: %s, stderr: %s" % (args.__repr__(), status, mystdout.buf, mystderr.buf)
VMBuilder.exception.VMBuilderException: Process (['umount', '/tmp/tmpSeDNMb/dev']) returned 1. stdout: , stderr: umount: /tmp/tmpSeDNMb/dev: device is busy.
(In some cases useful info about processes that use
the device is found by lsof(8) or fuser(1))