Hello budy, how are you?
How you configured the virtual machine before starting it.
Have you allocated 512mb of ram?
Does your machine have this amount of free memory to allocate to the virtual machine without compromising the rest of the ram for system use? I could be completely wrong, but I think vtx is tied to memory allocation. Another detail, did you use the 32-bit ubuntu options when mounting the machine image and used the image for the correct vm? If you can, send screenshots of how you did the vm configuration for us to analyze. I'm not very knowledgeable, but we are always willing to collaborate with each other.