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Roundcube webmail fails to load: Database error: connection failed! or Oops… something went wrong!

Roundcube webmail fails to open with one of the following error messages showing up in the browser:

Database error: connection failed!
Unable to connect to database!
Please contact your server-administrator.

OR

Oops... something went wrong!
An external 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.
When removing an email address in Plesk, the operation fails with the following error message:

DB query failed: SQLSTATE[42S02]: Base table or view not found: 1146 Table 'roundcubemail.users' doesn't exist, query was: DELETE FROM `roundcubemail`.`users` WHERE (username = '[email protected])
Error messages that are similar to the following are logged in /var/log/plesk-roundcube/errors:

[02-Aug-2024 15:03:23 +0000]: <q93si64j> DB Error: SQLSTATE[HY000] [1049] Unknown database 'roundcubemail' in /usr/share/psa-roundcube/program/lib/Roundcube/rcube_db.php on line 201 (GET /roundcube/index.php?_user=plesktest%40chaheko.com)
[02-Aug-2024 15:03:38 +0000]: <rbh6cg56> DB Error: SQLSTATE[HY000] [1049] Unknown database 'roundcubemail' in /usr/share/psa-roundcube/program/lib/Roundcube/rcube_db.php on line 201 (GET /)

DB Error: [1146] Table ‘roundcubemail.session’ doesn’t exist (SQL Query: INSERT INTO `session` ...

The roundcubemail database has become corrupted (most often due to hardware failures, sudden server shutdowns and interrupted updates).

Depending on your exact situation, restore the Roundcube database by using one of the following solutions:

Restore the Roundcube database from a daily dump

Recreate the Roundcube database by reinstalling the RoundCube component

Connect to the Plesk server via SSH
Switch to the directory with daily dumps:

# cd /var/lib/psa/dumps
List all available Plesk daily dumps:

# ls -l mysql.daily*
-rw------- 1 root root 236253 Feb 3 01:51 mysql.daily.dump.0.gz
-rw------- 1 root root 229653 Feb 2 01:48 mysql.daily.dump.1.gz
-rw------- 1 root root 222485 Feb 1 01:56 mysql.daily.dump.2.gz

Note: The file mysql.daily.dump.0.gz is the most recent dump.
Restore the roundcubemail database from the most recent daily dump (mysql.daily.dump.0.gz in this command):

# zcat mysql.daily.dump.0.gz | sed -n '/-- Current Database: `roundcubemail`/,/-- Current Database:*/p' | MYSQL_PWD=`cat /etc/psa/.psa.shadow` mysql -uadmin --default-character-set=utf8

Connect to the Plesk server via SSH
Create a copy of the roundcubemail database directory:

# cp -a /var/lib/mysql/roundcubemail /var/lib/mysql/roundcubemail_bak
Uninstall Roundcube webmail:

# plesk installer remove plesk --components roundcube
Remove any Roundcube leftovers:

# dpkg --purge plesk-roundcube

# rm -rf /usr/share/psa-roundcube

# rm -rf /etc/psa-webmail/roundcube
Drop the roundcubemail database:

# plesk db "drop database roundcubemail"
Install Roundcube:

# plesk installer add plesk --components roundcube

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