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*virt-manager* is based on a set of lower level virtualization tools,
going from the user interface to the hardware interactions with the
processor. This terminology is a bit confusing and other documentation
might mention the following tools:

*KVM* is the module of the Linux kernel that interacts with the virtualization features of the processor.

*QEMU* is the virtualization software that emulates virtual processors and peripherals based on *KVM* and that starts and stops virtual machines.

*libvirt* is a library that allows *virt-manager* to interact with the virtualization capabilities provided by *QEMU*.

*SPICE* is a protocol that allows to visualize the desktop of virtual machines.

*virt-manager* is the graphical interface that allows to create, configure, and run virtual machines.

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To install *virt-manager* in Debian, execute the following command:

To install *virt-manager* in Ubuntu, execute the following command:

Start *virt-manager*.

If you get the error message "<span class="guilabel">Error starting
domain: Requested operation is not valid: network 'default' is not
active</span>", then try to start the default virtual network:

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Then do the following:

Click on the **Add Hardware** button on the bottom of the left pane.