errors instaling virt-manager on 11.10

[Tapas Mishra]

Hi,
I am trying to install virt-manager on 11.10 on 64 bit machine
 sudo aptitude install virt-manager

here is where it stopped the install

Processing triggers for python-support ...
Errors were encountered while processing:
 libvirt-bin
E: Sub-process /usr/bin/dpkg returned an error code (1)
A package failed to install.  Trying to recover:
Setting up libvirt-bin (0.9.2-4ubuntu15) ...
useradd: cannot lock /etc/passwd; try again later.
adduser: `/usr/sbin/useradd -d /var/lib/libvirt -g kvm -s /bin/false -u 118
libvirt-qemu' returned error code 1. Exiting.
dpkg: error processing libvirt-bin (--configure):
 subprocess installed post-installation script returned error exit status 1
Errors were encountered while processing:
 libvirt-bin


What should be done in this case to resolve it?
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