import cv2 fails with ImportError: numpy.core.multiarray failed to import

Brand new user, fresh image, just downloaded and booted today (2019-06-18)
$ python3.6
Python 3.6.7 (default, Oct 22 2018, 11:32:17)
[GCC 8.2.0] on linux
Type “help”, “copyright”, “credits” or “license” for more information.

import cv2
ImportError: numpy.core.multiarray failed to import
Traceback (most recent call last):
File “”, line 1, in
ImportError: numpy.core.multiarray failed to import

After updating using the standard Ubuntu updater, it still fails.

After updating using the standard Ubuntu updater, it still fails.