Jan 23 12:20:28 rstudio apache2[83631]: Output of config test was:
Jan 23 12:20:28 rstudio apache2[83631]: [Tue Jan 23 12:20:28.528683 2018] [proxy_html:notice] [pid 83650:tid 140269135738752] **AH01425: I18n support in mod_proxy_html requires mod_xml2enc. Without it, non-ASCII characters in proxied pages**
**Jan 23 12:20:28 rstudio apache2[83631]: AH00526: Syntax error on line 3 of /etc/apache2/sites-enabled/rstudio.conf:**
Jan 23 12:20:28 rstudio apache2[83631]: ServerAlias only used in <VirtualHost>
Jan 23 12:20:28 rstudio apache2[83631]: Action 'configtest' failed.
Jan 23 12:20:28 rstudio apache2[83631]: The Apache error log may have more information.
Jan 23 12:20:28 rstudio systemd[1]: apache2.service: Control process exited, code=exited status=1
Jan 23 12:20:28 rstudio systemd[1]: Failed to start LSB: Apache2 web server.
Jan 23 12:20:28 rstudio systemd[1]: apache2.service: Unit entered failed state.
Jan 23 12:20:28 rstudio systemd[1]: apache2.service: Failed with result 'exit-code'.