Ubuntu

Install

Normal installation (not minimal) and:

apt install screen curl git vagrant emacs-nox openssh-server libvirt-daemon vagrant-libvirt ruby-libvirt qemu libvirt-daemon-system libvirt-clients ebtables dnsmasq-base libxslt-dev libxml2-dev libvirt-dev zlib1g-dev ruby-dev libguestfs-tools ebtables

Vagrant

Vagrant works as normal, but you will want to disable nat on the guest's interface:

virsh net-edit vagrant-libvirt
# remove the line:
#  <forward mode='nat'/>
systemctl restart libvirtd

Slack screensharing doesn't work

The problem is wayland. Here's how to disable wayland.