zoph, wordpress: mariadb server not running after install

Trying to install Wordpress on testing results in this error:

   ERROR plinth.actions       Error executing command - ['sudo', '-n', 'PYTHONPATH=/vagrant', '/vagrant/actions/wordpress', 'setup'], , ERROR 2002 (HY000): Can't connect to local server through socket '/run/mysqld/mysqld.sock' (111)
Traceback (most recent call last):
  File "/vagrant/actions/wordpress", line 204, in <module>
    main()
  File "/vagrant/actions/wordpress", line 200, in main
    subcommand_method(arguments)
  File "/vagrant/actions/wordpress", line 60, in subcommand_setup
    _create_database(DB_NAME)
  File "/vagrant/actions/wordpress", line 113, in _create_database
    subprocess.run(['mysql', '--user', 'root'], input=query.encode(),
  File "/usr/lib/python3.10/subprocess.py", line 524, in run
    raise CalledProcessError(retcode, process.args,
subprocess.CalledProcessError: Command '['mysql', '--user', 'root']' returned non-zero exit status 1.