Unable to install KVM on Ubuntu 16.04

I am trying to install KVM on Ubuntu 16.04, but I am getting stuck at very beginning.
I am unable to find the packages. Can someone help me? I did sudo apt-get update

sudo apt-get install qemu-kvm libvirt-bin

Reading package lists... Done
Building dependency tree       
Reading state information... Done
Package libvirt-bin is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source

E: Unable to locate package qemu-kvm
E: Package 'libvirt-bin' has no installation candidate

Solution 1:

First make sure that all repositories are enabled, open Software & Updates and mark all sources :

Now open a terminal and execute the following commands to install all the packages needed :

sudo apt update
sudo apt install qemu qemu-kvm  

When you additionally want to use a GUI for the KVM virtualization environment, execute this :

sudo apt install virt-manager  

Additional information : qemu-kvm depends on the appropriate qemu-system-$arch package, which gets automatically installed alongside when installing the qemu meta package. The very same is valid for the libvirt-bin package and all other qemu and libvirt related packages.