Install QEMU in Ubuntu (With Secure boot enabled)

Install QEMU in Ubuntu/Fidora/Kali Linux (With Secure boot enabled)

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STEP 1: Update the System
sudo apt update && sudo apt upgrade -y

STEP 2: Install QEMU
sudo apt install qemu-system-x86 qemu-utils libvirt-daemon libvirt-clients bridge-utils virt-manager -y

STEP 3: Verify Installation
qemu-system-x86_64 --version

STEP 4: Enable and Start Services
sudo systemctl enable --now libvirtd
sudo systemctl start libvirtd

STEP 5: Create HDD.qcow2
mkdir ~/qemu ; qemu-img create -f qcow2 ~/qemu/fedora_disk.qcow2

Step 6: Install ISO in ~/qemu/fedora_disk.qcow2 (HDD.qcow2)
qemu-system-x86_64 \
    -boot d \
    -cdrom /home/demo/Downloads/Fedora-Xfce-Live-x86_64-41-1.4.iso \
    -m 5048 \
    -enable-kvm \
    -drive file=~/qemu/fedora_disk.qcow2,format=qcow2

STEP 6: Start VM. Things you can modify
# -m = RAM / memory
# cpus = Number of cpu
# snapshot = off/on (off menans on, on means off)
qemu-system-x86_64 -boot c -m 4048 -enable-kvm -smp cpus=2 \
-drive file=~/qemu/fedora_disk.qcow2,format=qcow2,if=virtio,snapshot=off \
-device virtio-net,netdev=net0 -netdev user,id=net0 \
-monitor unix:/tmp/qemu-monitor-socket,server,nowait

STEP 7: Start with Full screen
# sudo dnf install virt-viewer
# sudo dnf install remote-viewer
# remote-viewer spice://localhost:5900
# or
# change the Display size in QEMU virtual MACHINE
qemu-system-x86_64 -boot c -m 4048 -enable-kvm -smp cpus=2 \
-drive file=~/qemu/fedora_disk.qcow2,format=qcow2,if=virtio,snapshot=off \
-device virtio-net,netdev=net0 -netdev user,id=net0 \
-monitor unix:/tmp/qemu-monitor-socket,server,nowait \
-spice port=5900,disable-ticketing=on -device virtio-vga

STEP 8: Connect Screen with remote-viewer
remote-viewer spice://localhost:5900

STEP 9: Snapshots
# Start vm using (Step 6)
# Ensure that snapshot=off in the commands
# Open new terminal and paste command
# Use the command to get in to (qemu) shell and follow step 10
nc -U /tmp/qemu-monitor-socket

STEP 10: How to use Qemu Shell to save/load/delete/list snapshot?
(qemu) savevm snapshot_name # Use command to save Snapshot
(qemu) loadvm snapshot_name # To load Snapshot
(qemu) info snapshots # To list all Snapshots
(qemu) delvm snapshot_name # Delete snapshot