This happened because a previous attempt at installation failed before completion. As a result, the MySQL tables were already modified, but no record of the product installation was made, so it was not possible to reverse the changes that were made.
You will keep receiving the same messages until you restore your database to its structure before the first installation attempt. To do this, you can either restore a backup, or look through the code of special_install.php to see what changes were made, and remove those changes manually.
For example, to fix this query, you would have to DROP the textid field from nuwiki_ceslink. However, if this were the only change you made, you would likely get another error on a different field, because this was only the first duplicate encountered.