I intalled the Unity Photo Lens using this commands:
sudo add-apt-repository ppa:scopes-packagers/ppa && sudo apt-get update sudo apt-get install unity-lens-photo unity-scope-flickr unity-scope-shotwell
And then downloading and executing a deb package found here. Flickr scope works fine. However, the Shotwell scope is not working and has caused errors in my system. The question is how can I remove or uninstall the Shotwell scope or any scope without affecting others scopes or lenses? Thanks!