Command Center

After you copy an Ubuntu image, you'll probably lose your network connectivity. After a little bit of digging, it turns out that Ubuntu persists the MAC address of the network device in /etc/udev/rules.d/*net.rules . The fix:

sudo rm /etc/udev/rules.d/*net.rules
  sudo shutdown -r now #to reboot 

REFERENCES

http://muness.blogspot.com/2009/01/no-network-after-copying-ubuntu-vmware.html