Comment 1 for bug 966439

I too am experiencing thigs bug on oneiric trying to build a lucid guest with a command line like:

vmbuilder kvm ubuntu --suite lucid --arch i386 -o --libvirt qemu:///system --ip 172.29.5.50 --dns 172.29.5.2 --bridge br0 --user system --pass system

On my system, it not only gives this error but it's actually broken out of the chroot jail and I cannot remove the /tmp/tmp* dir because the host kernel is now using it somehow.

for example:
[11068.758303] init: /tmp/tmpWi7L20/etc/init: Configuration directory deleted

2012-04-02 19:59 DEBUG : Output from template '/etc/vmbuilder/ubuntu/sources.list.tmpl': deb http://archive.ubuntu.com/ubuntu lucid main restricted universe
deb http://archive.ubuntu.com/ubuntu lucid-updates main restricted universe
deb http://security.ubuntu.com/ubuntu lucid-security main restricted universe

2012-04-02 19:59 DEBUG : ['chroot', '/tmp/tmpjwPN8y', 'apt-get', 'update']
2012-04-02 19:59 DEBUG : Hit http://security.ubuntu.com lucid-security Release.gpg
2012-04-02 19:59 DEBUG : Hit http://archive.ubuntu.com lucid Release.gpg
2012-04-02 19:59 DEBUG : Hit http://archive.ubuntu.com lucid-updates Release.gpg
2012-04-02 19:59 DEBUG : Hit http://security.ubuntu.com lucid-security Release
2012-04-02 19:59 DEBUG : Hit http://archive.ubuntu.com lucid Release
2012-04-02 19:59 DEBUG : Hit http://security.ubuntu.com lucid-security/main Packages
2012-04-02 19:59 DEBUG : Hit http://archive.ubuntu.com lucid-updates Release
2012-04-02 19:59 DEBUG : Hit http://security.ubuntu.com lucid-security/restricted Packages
2012-04-02 19:59 DEBUG : Hit http://security.ubuntu.com lucid-security/universe Packages
2012-04-02 19:59 DEBUG : Hit http://archive.ubuntu.com lucid/main Packages
2012-04-02 19:59 DEBUG : Hit http://archive.ubuntu.com lucid/restricted Packages
2012-04-02 19:59 DEBUG : Hit http://archive.ubuntu.com lucid/universe Packages
2012-04-02 19:59 DEBUG : Hit http://archive.ubuntu.com lucid-updates/main Packages
2012-04-02 19:59 DEBUG : Hit http://archive.ubuntu.com lucid-updates/restricted Packages
2012-04-02 19:59 DEBUG : Hit http://archive.ubuntu.com lucid-updates/universe Packages
2012-04-02 19:59 DEBUG : Reading package lists...
2012-04-02 19:59 DEBUG : ['chroot', '/tmp/tmpjwPN8y', 'apt-get', 'clean']
2012-04-02 19:59 DEBUG : ['umount', '/tmp/tmpjwPN8y/proc']
2012-04-02 19:59 DEBUG : ['umount', '/tmp/tmpjwPN8y/dev/pts']
2012-04-02 19:59 DEBUG : ['umount', '/tmp/tmpjwPN8y/dev']
2012-04-02 19:59 INFO : umount: /tmp/tmpjwPN8y/dev: device is busy.
2012-04-02 19:59 INFO : (In some cases useful info about processes that use
2012-04-02 19:59 INFO : the device is found by lsof(8) or fuser(1))
2012-04-02 19:59 INFO : Cleaning up
2012-04-02 19:59 ERROR : Process (['umount', '/tmp/tmpjwPN8y/dev']) returned 1. stdout: , stderr: umount: /tmp/tmpjwPN8y/dev: device is busy.