Uninstall Observium Ubuntu |link| 〈100% Direct〉

sudo apt-get purge php.* sudo apt-get autoremove

DROP DATABASE observium; DROP USER 'observium'@'localhost'; FLUSH PRIVILEGES; EXIT; uninstall observium ubuntu

Then drop the database:

Observium often runs under www-data , but some setups create a dedicated observium user. If present: sudo apt-get purge php