Comment 2 for bug 1759796

if your system is updated, then you should be affected by that typo which was fixed :

dh-python (3.20180325ubuntu2) bionic; urgency=medium

  * Fix typo and really depend on python3-distutils

 -- Jeremy Bicha <email address hidden> Mon, 26 Mar 2018 15:42:23 -0400

dh-python (3.20180325ubuntu1) bionic; urgency=medium

  * Make python3-distutils a dependency, not just a recommendation.

 -- Matthias Klose <email address hidden> Mon, 26 Mar 2018 19:14:03 +0800