======Debian 10 (Buster)======
Creating groups with debian is weird, because it does not have the usermod utility mapped. you must execute ''/sbin/usermod'' instead.
As opposed to Ubuntu 18.04, Firefox is ESR instead of latest.
=====How to install QEMU/KVM=====
https://linuxhint.com/install_kvm_debian_10/\\
The above link is pretty much exactly how you would want to go about installing qemu. The exact instructions are written below.
Install qemu.
$ sudo apt install qemu qemu-kvm qemu-system qemu-utils
Install libvirt to manage VMs.
sudo apt install libvirt-clients libvirt-daemon-system virtinst
Check to see if the libvirt daemon is running, if it is not, start it.
$ sudo systemctl status libvirtd
Enable the default network, check if it is on and enabled to autostart.
$ sudo virsh net-list --all
$ sudo virsh net-start default
$ sudo virsh net-autostart default
Install libvirt-manager
$ sudo apt install libvirt-manager