Install QEMU Guest Agent on Proxmox VM

Unix

su -
apt update
apt -y install qemu-guest-agent
systemctl enable --now qemu-guest-agent
systemctl status qemu-guest-agent

^[1]

Windows

1. Download the latest stable VirtIO ISO
2. Mount it to the VM
3. Open the Windows Explorer and navigate to the CD-ROM drive.
4. Execute virtio-win-guest-tools.exe
5. Follow its instructions
6. Reboot the VM

^[2]

Relevant Note(s): Proxmox Setup