Turns out its a Privileges issue. When creating a new MySQL restricted database user, using the uniform server console>MySQL> Create Restricted MySQL user, the privileges listed there are apparently not enough for some Joomla packages to install. To resolve this I used the Uniform Server Console>phpMyAdmin and selected my DB name in left the panel. Next go to Privileges in upper bar, for correct DB User, select edit and select all privileges. Now Joomla installs its packages correctly.