I tried posting a reply to the relevant topic below but I got permission denied.
<a href="http://ubuntuforums.org/showthread.php?t=333349">No Network after VMWare copy/clone</a>
Anyway, that solution for Ubuntu 6.x doesn't work for 9.10.
The solution to fix networking after a vmware copy/clone in Ubuntu 9.10 is to delete some files under udev and restart
And networking will work again after the system comes back up.
# rm -fr /etc/udev/rules.d/70-*
# shutdown -r now
The files get refreshed on boot and insert the new mac address from your vware .vmx file.
This also works if your networking is broken in virtualbox after vm copy
This also works for Ubuntu 10.04