Add some missing build dependencies.

debian/control

@@ -4,7 +4,12 @@ Priority: optional
 Maintainer: Lubuntu Developers <lubuntu-devel@lists.ubuntu.com>
 Uploaders: Simon Quigley <tsimonq2@ubuntu.com>,
            Julien Lavergne <gilir@ubuntu.com>
-Build-Depends: debhelper (>= 11), dh-python, python3-all, python3-setuptools
+Build-Depends: debhelper (>= 11),
+               dh-python,
+               python3-all,
+               python3-distutils,
+               python3-distutils-extra,
+               python3-setuptools
 Standards-Version: 4.1.3
 Homepage: https://github.com/lubuntu-team/lubuntu-about
 X-Python3-Version: >= 3.6