Comment 1 for bug 1798776

A minimal Ubuntu 18.10 installation comes by default with python3 only:
$ ls /usr/bin/python*
/usr/bin/python3 /usr/bin/python3.6 /usr/bin/python3.6m /usr/bin/python3m

The 'shebang' in /usr/bin/kvm_stat points to /usr/bin/python:
$ grep \#\! /usr/bin/kvm_stat
#!/usr/bin/python
Which is usually python version 2.x.

kvm_stat should work with python 2 or 3.
Since python3 is the default and because python 2 is legacy, the shebang in kvm_stat should better point to python3.

As a workaround create a link or an alias
or install python-minimal (which is python2):
$ sudo apt install python-minimal
...
and 'sudo kvm_stat' will work again.