The major target of posting bellow is supposed to demonstrate thatvirt-manager is not required to enable UEFI support for KVM Guest on Linux . See recent post at Lxer “Enable UEFI Support For KVM Virtual Machines In Linux”. First – don’t specify “Start immediately” and switch Firmware to “UEFI” been inside Web Cockpit Console

Source: LXer – Enable UEFI Support for KVM Virtual Machines on F32 Server via Web Cockpit Console