Often with virtualised servers you can have a slow time generating entropy for virtualised systems and you get stuck with this message:

 We need to generate a lot of random bytes. It is a good idea to perform some other action (type on
 the keyboard, move the mouse, utilize the disks) during the prime generation; this gives the 
random number generator a better chance to gain  enough entropy.
 

The quickest way in my opinion is the following command. Just make sure you have a dvd / cdrom iso mounted and connected with vmware.

 until [ 1 = 0 ]; do dd if=/dev/sr0 of=/tmp/dvd.iso; rm /tmp/dvd.iso -f; done 

and ^C when your done!