04 LTS Server and i want to install a virtual audio. Can i get a good virtual audio software?
You don't need to install anything to create a purely virtual audio device in ALSA. Load snd-aloop with the following command:
modprobe snd-aloop
You also asked about a good virtual audio software. Another software that may be useful is alsa-utils which is run from the terminal:
sudo apt install alsa-utils