ubuntu-vm-builder error log

gistfile1.txt

user0@ML110:~/vm$ sudo ubuntu-vm-builder kvm oneiric --domain vm10 --dest vm10 --arch i386 --hostname  vm10 --mem 512 --user username --pass password --ip 192.168.1.101 --mask 255.255.255.0 --net 192.168.1.0 --bcast 192.168.1.255 --gw 192.168.1.1 --dns 192.168.1.1 --mirror http://jp.archive.ubuntu.com/ubuntu --components main,universe  \ --debug 
2012-01-25 00:35:26,124 INFO    : Calling hook: preflight_check
2012-01-25 00:35:26,127 INFO    : Calling hook: set_defaults
2012-01-25 00:35:26,128 INFO    : Calling hook: bootstrap
2012-01-25 00:39:52,363 INFO    : Calling hook: configure_os
2012-01-25 00:40:09,253 INFO    : 
2012-01-25 00:40:09,254 INFO    : Current default time zone: 'Etc/UTC'
2012-01-25 00:40:09,258 INFO    : Local time is now:      Tue Jan 24 15:40:09 UTC 2012.
2012-01-25 00:40:09,259 INFO    : Universal Time is now:  Tue Jan 24 15:40:09 UTC 2012.
2012-01-25 00:40:09,259 INFO    : 
2012-01-25 00:40:24,179 INFO    : 
2012-01-25 00:40:24,179 INFO    : Current default time zone: 'Etc/UTC'
2012-01-25 00:40:24,184 INFO    : Local time is now:      Tue Jan 24 15:40:24 UTC 2012.
2012-01-25 00:40:24,184 INFO    : Universal Time is now:  Tue Jan 24 15:40:24 UTC 2012.
2012-01-25 00:40:24,184 INFO    : Run 'dpkg-reconfigure tzdata' if you wish to change it.
2012-01-25 00:40:24,184 INFO    : 
2012-01-25 00:40:34,848 INFO    : restart: Unknown instance: 
2012-01-25 00:40:44,693 INFO    : umount: /tmp/tmpJ5KaGm/dev: device is busy.
2012-01-25 00:40:44,694 INFO    :         (In some cases useful info about processes that use
2012-01-25 00:40:44,694 INFO    :          the device is found by lsof(8) or fuser(1))
2012-01-25 00:40:44,694 INFO    : Cleaning up
2012-01-25 00:40:44,694 ERROR   : Process (['umount', '/tmp/tmpJ5KaGm/dev']) returned 1. stdout: , stderr: umount: /tmp/tmpJ5KaGm/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 <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 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/tmpJ5KaGm/dev']) returned 1. stdout: , stderr: umount: /tmp/tmpJ5KaGm/dev: device is busy.
        (In some cases useful info about processes that use
         the device is found by lsof(8) or fuser(1))

user0@ML110:~/vm$ pwd
/home/user0/vm
user0@ML110:~/vm$ cat /etc/network
network/  networks  
user0@ML110:~/vm$ cat /etc/network/interfaces
interfaces      interfaces.bak  
user0@ML110:~/vm$ cat /etc/network/interfaces
auto lo
iface lo inet loopback
auto eth0
iface eth0 inet manual
auto br0
iface br0 inet static
        address 192.168.1.100
        network 192.168.1.0
        netmask 255.255.255.0
        broadcast 192.168.1.255
        gateway 192.168.1.1
        bridge_ports eth0
        bridge_fd 9
        bridge_hello 2
        bridge_maxage 12
        bridge_stp off
        dns-nameservers 192.168.1.1 8.8.8.8
user0@ML110:~/vm$ uname -a
Linux ML110 3.0.0-15-generic #25-Ubuntu SMP Mon Jan 2 17:45:26 UTC 2012 i686 i686 i386 GNU/Linux
user0@ML110:~/vm$ kvm-ok
INFO: /dev/kvm exists
KVM acceleration can be used
user0@ML110:~/vm$ LANG=C
user0@ML110:~/vm$ ifconfig
br0       Link encap:Ethernet  HWaddr 10:1f:74:3b:f6:bb  
          inet addr:192.168.1.100  Bcast:192.168.1.255  Mask:255.255.255.0
          inet6 addr: fe80::121f:74ff:fe3b:f6bb/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:442369 errors:0 dropped:0 overruns:0 frame:0
          TX packets:268989 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:623175133 (623.1 MB)  TX bytes:22003012 (22.0 MB)

eth0      Link encap:Ethernet  HWaddr 10:1f:74:3b:f6:bb  
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:447158 errors:0 dropped:0 overruns:0 frame:0
          TX packets:270990 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:633015729 (633.0 MB)  TX bytes:23358618 (23.3 MB)
          Interrupt:19 

lo        Link encap:Local Loopback  
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)

virbr0    Link encap:Ethernet  HWaddr 02:fa:1c:0d:91:96  
          inet addr:192.168.122.1  Bcast:192.168.122.255  Mask:255.255.255.0
          UP BROADCAST MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)

user0@ML110:~/vm$