Question: I have seen several debates on different forums but could not reach to a solution.
My notebook has a UHD display running windows 8 as host OS. I have tried Vmware and virtualbox as VMs to have the experience of Ubuntu 14.04 as guest OS. The problem is with the screen resolution I get in the VM, either on a full screen or in any other view size. It's nano and awful. 

My question specifically is: Is there any VM which supports Ubuntu 14.04 in such a way that we can control the resolution with the best results for user on any notebook with a UHD display?

**OR**

If any plausible solution exists, even for the mentioned VMs, which I am missing?

Answer: 
VirtualBox or VMware does not care what resolution the guest or the host is running. Both use what they find. To view correctly in the guest system, the installed guest operating system is solely responsible and in your case 14.04. 

But as I already wrote [here](https://askubuntu.com/a/675569/367165):

> 
> The 4K technology is relatively new. On the other hand your system is
>  relatively old. If you want to improve the situation, then you must
>  use newer software versions. A first step is to update your system to
>  Vivid or to Wily in some days. And then the application developers are
>  required. The individual applications have to be adjusted.
> 
> 
> 

Therefore install Vivid or Wily and have patience and in any case, install the guest addons, e.g. *VMware Tools* and/or Oracle *VM VirtualBox Extension Pack*.
I ran into a simular issue with my Surface Pro. The solution that I use is simply changing the settings in ubuntu to set the dpi. You can simply go to all settings > displays > scale for menu and title bars and mess with this value until you find something that is easy for you to read. If you core issue is with graphics performance this will not help and you will also need to install the tools like others have answered.