error message of python3-venv does not lead to success with no-install-recommends

on my bionic system with apt configured to to no installation of recommends:

$ apt-get install -y python3-venv python3-pip
Reading package lists...
Building dependency tree...
Reading state information...
The following additional packages will be installed:
  python-pip-whl python3-distutils python3-lib2to3 python3.6-venv
Recommended packages:
  build-essential python3-dev python3-setuptools python3-wheel
The following NEW packages will be installed:
  python-pip-whl python3-distutils python3-lib2to3 python3-pip python3-venv
  python3.6-venv
0 upgraded, 6 newly installed, 0 to remove and 0 not upgraded.
Need to get 1718 kB of archives.
After this operation, 4388 kB of additional disk space will be used.
Get:1 http://archive.ubuntu.com/ubuntu bionic/universe amd64 python-pip-whl all 9.0.1-2 [1379 kB]
Get:2 http://archive.ubuntu.com/ubuntu bionic/main amd64 python3-lib2to3 all 3.6.5-3 [76.6 kB]
Get:3 http://archive.ubuntu.com/ubuntu bionic/main amd64 python3-distutils all 3.6.5-3 [141 kB]
Get:4 http://archive.ubuntu.com/ubuntu bionic/universe amd64 python3-pip all 9.0.1-2 [114 kB]
Get:5 http://archive.ubuntu.com/ubuntu bionic/universe amd64 python3.6-venv amd64 3.6.5-3 [6036 B]
Get:6 http://archive.ubuntu.com/ubuntu bionic/universe amd64 python3-venv amd64 3.6.5-3 [1204 B]
debconf: delaying package configuration, since apt-utils is not installed
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Preparing to unpack .../0-python-pip-whl_9.0.1-2_all.deb ...
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Setting up python3.6-venv (3.6.5-3) ...
Setting up python3-pip (9.0.1-2) ...
Setting up python3-lib2to3 (3.6.5-3) ...
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Setting up python3-venv (3.6.5-3) ...

$ python3 -m venv $CACHE_VENV_DIR
The virtual environment was not created successfully because ensurepip is not
available. On Debian/Ubuntu systems, you need to install the python3-venv
package using the following command.

    apt-get install python3-venv

You may need to use sudo with that command.

I have just installed that package.