Unable to access RoundCube webmail with the 500 error: the /usr/lib/x86_64-linux-gnu/libmysqlclient.so.18 symlink is missing

Ivan Kamnev

Updated April 05, 2023 04:01

kb: technical Plesk Onyx for Linux ABT: Group A

Applicable to:

Unable to access RoundCube webmail on a Plesk server with the error:

PLESK_INFO: 500 Internal Server Error
The errors below can be found in /var/log/plesk-roundcube/errors file:

CONFIG_TEXT: PHP Fatal error: Undefined class constant 'MYSQL_ATTR_FOUND_ROWS' in /usr/share/psa-roundcube/program/lib/Roundcube/rcube_db_mysql.php on line 144

The /usr/lib/x86_64-linux-gnu/libmysqlclient.so.18 symlink is missing.

Log into the server via SSH.
Using the command below create the missing symlink:

# ln -s libmariadb.so.3 /usr/lib/x86_64-linux-gnu/libmysqlclient.so.18