2 dedicated server with master-master replication 1. I upgraded it from ubuntu 18.04.05 to 20.04.2 via do-release-upgrade 2. install necessary software describe in ISPConfig for Ubuntu20.04 3. run ispconfig_update.sh --force to upgrade ispconfig server from 3.1.15p3 to 3.2.4 I initial got issue with roundcube but was able to fix it by dpkg-reconfigure and apt upgrade. I notice my mysql config for master-master replication was gone and mysql was upgraded to 8.0 but the data seems to be intact. php7.2-fpm was upgraded also to php7.4-fpm
fixed by granting permission to ispconfig user GRANT SESSION_VARIABLES_ADMIN ON *.* TO ispconfig@localhost; GRANT SYSTEM_VARIABLES_ADMIN ON *.* TO ispconfig@localhost;