Debian has issued an advisory on December 15:
These issues and others are fixed upstream in 1.35.5:
Updated packages uploaded for Mageia 8 and Cauldron.
Updated packages in core/updates_testing:
MGA8-64 Plasma on Lenovo B50 in Dutch
For future reference, first remove the old wiki as stated in the wiki before installing!!!!
No installation issues.
Ref bug 27781
Make sure httpd and mysqld are running.
# systemctl start httpd
# systemctl start mysqld
Then created the user and database along the lines of the wiki, using phpMyadmin, then the rest of the wiki. All works OK.
An update for this issue has been pushed to the Mageia Updates repository.