Resolving the File Attachment Conflict in Roundcube

Introduction

If you see the following error when setting up Roundcube’s Enigma plugin for encryption the following article should solve the issue.

Error:

PHP Error: Can use only one plugin for attachments/file uploads! Using 'filesystem_attachments', ignoring others. in /var/www/roundcube/plugins/filesystem_attachments/filesystem_attachments.php

Steps to Fix:

• Open the main Roundcube configuration file:

  /var/www/roundcube/config/config.inc.php
  

• Locate the $config['plugins'] array and remove:

  filesystem_attachments: $config['plugins'] = array('enigma', /* other plugins */);
  

• Save the file and exit.
• Clear Roundcube’s cache to ensure the changes are applied:

  php /var/www/roundcube/bin/cleardbcache
  

• Restart the web server:

  sudo systemctl restart apache2
  

Why This Happens

The filesystem_attachments plugin and the Enigma plugin both attempt to manage file uploads, leading to a conflict.

By disabling the filesystem_attachments plugin, Enigma can properly handle attachments, such as encrypted keys or messages. Alternative

If you absolutely need the filesystem_attachments plugin:

• Review its documentation to see if you can configure it to coexist with the Enigma plugin.
• Alternatively, consider modifying one of the plugins to prioritize its behavior (this may require advanced customization).

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