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I made fresh install of system and virtualmin.. (debian 9, 2gb rab) and ...
Creating MySQL login .. .. MySQL database failed! : mysql::execute_sql_logged failed : SQL alter user 'gfdn'@'localhost' identified by 'test123' failed : You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'user 'gfdn'@'localhost' identified by 'test123'' at line 1 at /usr/share/webmin/web-lib-funcs.pl line 1476.
There are more people affected by this problem! See this link!
https://www.virtualmin.com/node/64694#comment-808676