Please try:
sed -i "s/\$config\['auto_create_user'] = false;/\$config\['auto_create_user'] = true;/g" /etc/roundcube/config.inc.php
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browser:
Oops… something went wrong!
An internal error has occurred. Your request cannot be processed at this time.
For administrators: Please check the application and/or server error logs for more information.
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Needs to be true;
nano config.inc.php
Search for auto_create_user and add an ; after true
The page is not available
mail.jgfchexrjq.tk is unable to process this request yet.
HTTP ERROR 500
Check /var/log/nginx/domains/webmail.domain.com.error.log
/var/log/nginx/domains/webmail.jgfchexrjq.tk.error.log - empty
/var/log/nginx/domains/mail.jgfchexrjq.tk.error.log - empty
/var/log/nginx/domains/mail.jgfchexrjq.tk.log - don`t empty
nano config.inc.php
Search for auto_create_user
Make sure it reads $config[‘auto_create_user’] = true;
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I swear:
// Automatically register user in Roundcube database on successful (IMAP) logon.
// Set to false if only registered users should be allowed to the webmail.
// Note: If disabled you have to create records in Roundcube users table by yourself.
// Note: Roundcube does not manage/create users on a mail server.
['auto_create_user'] = true;
Sorry, lost “$config”. Worked!!! Grazie!!!
Thank you very much its working now. turned false to true 
Yes …
For the sake of completeness…
Ubuntu 18.04.06:
$config[‘auto_create_user’] = false;
and
Debian 9
$config[‘auto_create_user’] = false;
Best regards
Tom
It should changed to true…
I will test it. So far everything is working.
It is only not working if you create a new account and try to login for the first time via Roundcube.
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Then I still have a few changes to make 
please, where is the path in Debian, if you now? i did not found config.inc.php
/etc/roundcube/config.inc.php
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hi @eris
you’ve told me else where to reinstall hestia
will i need to apply the steps commented here, or the reinstall will do it all right?
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Reinstall should fix it
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