Ubuntu – ny virtualization software which can run x64 bit guest os without vt-x support Hardware

I don't know much about Player, but Vbox defaults are not good for Ubuntu releases that prefer a real GPU.

• On spinning HDDs, pre-allocate the entire virtual disk. On SSDs, it doesn't matter. VDI / qcow2 sparse allocations do reduce performance, but the reductions involved appear to be less than 10% since 2015. Weigh the performance vs convenience.
• Allocate only the storage you need. Keep large files elsewhere, outside the vStorage.
• Never allocate more CPUs or RAM than you should. 1 vCPU is probably enough.
• Leave 1GB of RAM for the HostOS. Do not over commit RAM.
• Use the VirtIO drivers for Storage and Networking. Modern Linux guests support this. For Windows guests, use the SATA (storage) and Intel PRO/1000 (network) drivers. It is possible to use virtio drivers under Windows, it is just a little harder.
• Enable ACPI and AHCI for all guests from 2003, WinXP and later.
• Desktop VMs should get all 128MB of display vRAM
• Server VMs should stay with 9MB of vRAM; don't waste it.
• Avoid 2D and 3D accel settings, until you have everything else working the way you like. I'm serious. Ubuntu does bad things when this is enabled. It can bring a Core i7 to the ground.

For more details: http://blog.jdpfu.com/2012/09/14/solution-for-slow-ubuntu-in-virtualbox

Possible workaround:

After editing the VM's .vmx file to add

mouse.vusb.enable = "TRUE"
mouse.vusb.useBasicMouse = "FALSE"
usb.generic.allowHID = "TRUE"

you'll be able to use your five-button mouse in the VM. To do so, open your VM, then navigate to Virtual Machine > Removable Devices > [Your Mouse] > Connect (Disconnect from Host). You'll get a couple warnings that you won't be able to use your mouse with the host anymore, and just click OK.

Now you can only use your mouse within the VM whether it's full-screen or in windowed mode. Hit Ctrl-G on your keyboard to get rid of the host mouse icon and fully immerse yourself in the VM. Once you need your mouse again outside the VM, hit Ctrl+Alt, then release. Now the focus is back to your host OS. Hold Alt and push V to bring up the Virtual Machine menu, and use your arrow keys to navigate to Virtual Machine > Removable Devices > [Your Mouse] > Disconnect (Connect to Host).

Now everything is back to normal. Hopefully something will change in either Ubuntu or VMWare Player soon to make it easier than this.