Not a bug - just a comment on the update procedure on a Debian install, if that is of any help….
These are the working commands on a Debian install.
sudo -u www-data php update_cli.php
sudo -u www-data php update_cli.php --update_db (Several times from 1.8.7 through all minor versions to 2.1.2)
Thx guys. Can't wait to have a look at all the improvements :-)