First, install Virtual Machine Manager Package.

This must be obtained from the Synology Package center. Since the Virtual Machine Manager is currently in beta, please check that the option “Yes, I want to see beta version!”  is selected.

Next, Set up a system image for Ubuntu ISO.
Create and spec Virtual Machine, defining the number of CPUs and RAM.
Launch and setup Ubuntu.

And Finally an important last step; which will enable Ubuntu to communicate with the Synology host.

‘$ sudo apt-get install qemu-guest-agent’

Please follow the link for the complete video on youtube by TechWizTime