Thanks ZhangHuangbin I open "/usr/share/apache2/roundcubemail/config/db.inc.php" and the only variable I found that could be useful is "$rcmail_config['db_dsnw'] = "mysqli://" I change it to "$rcmail_config['db_dsnw'] = "mysqli:roundcube:VUzgoomtJBhwAxxxxxxMvOP3KiC@127.0.0.1/roundcubemail";" and create the user roundcube with password VU*iC in mysql, but still not working.
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