You can delete an instance with the following command:

sudo opc inst -i {helpdeskID} delete

You will then be prompted to confirm the action by typing the word delete to continue.

deskpro@deskpro:~# sudo opc inst -i helpdesk delete
 WARNING  This is a dangerous action. Please type "delete" proceed or press CTRL+C to cancel
> delete
                                                                                                                                              
Delete instance                                                                                                                               
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
Name                     | helpdesk                                
UUID                     | 190249db-bf69-41c9-97cc-639be5a663a7
Data Path                | /opt/deskpro/data/instances/helpdesk    
DB Host                  | localhost:3306                      
DB User                  | helpdesk                                
DB Name                  | helpdesk                                
Elastic Host             | http://localhost:9200/              
Elastic TenantID         | helpdesk                                
Reserved Container Ports | Web: 39323                          
                   
Remove NGINX config
✅  Unlinked NGINX config                                           
    └ Path: /etc/nginx/conf.d/deskpro_helpdesk.conf                     
              
Remove indexes

✅  Removed index                                
    └ Index `deskpro`, tenant `helpdesk`             
                          
Remove instance containers

✅  Deleted instance containers                                                         
    └ Path: /opt/deskpro/data/instances/helpdesk/services/deskpro                           
                      
Remove system services
✅  Deleted system services                            
    └ Path: deskpro@helpdesk.service                       
               
Remove database

✅  Deleted database                           
    └ DB `helpdesk` and user `helpdesk`                
                                
Remove configuration directories
✅  Deleted configuration directories                                        
    └ Path: /opt/deskpro/data/instances/helpdesk                               
                                                                                                                                              
Done                                                                                                                                          
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
All tasks have completed.
 copy

If you experience any issues with deleting an instance, you can add the flag --ignore-errors to skip any errors and attempt to delete the instance.