Ubuntu-VM-Builder: Зависит от: Python, но он не будет установлен [дубликат]

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Я пользователь Ubuntu 18.04.3. При попытке установить kvm с помощью этой команды:

sudo apt-get install qemu-kvm libvirt-bin ubuntu-vm-builder bridge-utils

я получаю следующий результат:

Reading package lists... Done
Building dependency tree       
Reading state information... Done
bridge-utils is already the newest version (1.5-15ubuntu1).
libvirt-bin is already the newest version (4.0.0-1ubuntu8.6).
qemu-kvm is already the newest version (1:2.11+dfsg-1ubuntu7.9).
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
   ubuntu-vm-builder : Depends: python but it is not going to be 
   installed
                 Depends: python:any (>= 2.5~)
                 Depends: python-vm-builder but it is not going to be 
                 installed
E: Unable to correct problems, you have held broken packages.