The Complete Guide: How to Fully Uninstall Observium from Ubuntu

He opened a fresh terminal window and typed:

Method 2: Uninstall Observium from Source

• If Observium created a dedicated user (e.g., observium or poller), remove it after ensuring no other services use it: sudo userdel -r observium # -r removes home dir
• Remove group if present: sudo groupdel observium

Check that Observium is removed: