LAMP Stack Upgrade Issues

"Table Doesn't Exists" After MySQL/MariaDB Upgrade

Paste MySQL data directory to upgraded data directory, containing ibdata1, ib_logfile0 and ib_logfile1, in lampp, it's /opt/lampp/var/mysql:

1. sudo cp /opt/lampp_backup/var/mysql /opt/lampp/var/mysql
2. sudo chown -R mysql:mysql /opt/lampp/mysql