我正在运行 Ubuntu 16.04，并且安装了 apache、postgres 并部署了 ssl，但是出现了此错误：
AH01425: I18n support in mod_proxy_html requires mod_xml2enc. Without it, non-ASCII characte
Jul 10 17:31:41 server.com apache2[2021]: AH00526: Syntax error on line 47 of /etc/apache2/sites-enabled/000-webui.conf:
Jul 10 17:31:41 server.com apache2[2021]: Can't load driver file apr_dbd_pgsql.so
Jul 10 17:31:41 server.com apache2[2021]: Action 'configtest' failed.
Jul 10 17:31:41 server.com apache2[2021]: The Apache error log may have more information.
Jul 10 17:31:41 server.com systemd[1]: apache2.service: Control process exited, code=exited status=1
Jul 10 17:31:41 server.com systemd[1]: Failed to start LSB: Apache2 web server.
-- Subject: Unit apache2.service has failed
-- Defined-By: systemd
有什么解决办法吗？