The detailed steps of installing Home Assistant Operating System on Ubuntu

Install virt-manager

apt install virt-manager or sudo apt install virt-manager

Config internet

apt install net-tools or sudo apt install net-tools

ifconfig

Mark the adapter name, eno1, enp1s0..

Create a netplan yaml file as:

# This is the network config written by 'subiquity'
network:
  ethernets:
    eno1:
      dhcp4: true
  version: 2
  bridges:
    br0:
      dhcp4: yes
      interfaces:
             - eno1
      parameters:
        stp: true

netplan generate or sudo netplan generate

netplan apply or sudo netplan apply

apt install bridge-utils or sudo apt install bridge-utils

brctl show

Mark the bridge adapter name, br0 or something else.

Prepare the image

Download the latest image.
Decompress it, if needed. Note that some .xz files were broken.

xz -d -v haos_ova-10.4.qcow2.xz

360 zip works perfect.

Install the HAOS VM

virt-install --import --name hass --description "Home Assistant OS" --os-variant=generic \
--memory 2048 --vcpus 2 --cpu host \
--disk <path to qcow2 file>,format=qcow2,bus=virtio \
--network bridge=br0,model=virtio \
--osinfo detect=on,require=off \
--graphics none \
--noautoconsole \
--boot uefi \
--autostart