Download the ISO image to the /var/lib/libvirt/images folder of the KVM host. Start virt-manager and opt to create a new VM and select Local install media. Click on browse and select the downloaded ISO image If the OS is not automatically detected, uncheck automatic detection and type in Debian testing Assign memory and CPU resources….
OS installation: Debian 11 on the bare metal server.
Download and burn the ISO image onto a USB stick and plug in the USB stick in the server. Power On the server (in my case, it is Dell R430) Press F11 to enter boot manager Select one-shot UEFI menu Select boot from the USB stick Start installation (I prefer to use non-graphical) Select Language…