For a Proxmox guest, whether its Windows or Linux, the VirtIO and Qemu-system drivers need to be installed.
Full detailed guide: https://pve.proxmox.com/wiki/Windows_VirtIO_Drivers
Windows
- Download the latest “virtio-win-XXX” package from Fedora
- Install the “virtio-win-gt-x64.msi” driver
- Install the (optional) “virtio-win-guest-tools.exe” driver
- Reboot the guest
Linux
- Execute the commands below
# Install the Qemu driver package
sudo apt install --no-install-recommends qemu-system libvirt-clients libvirt-daemon-system
# Install the Qemu guest agent
sudo apt-get install qemu-guest-agent
2. Reboot the guest