When it asks you to update sources are you selecting YES? If you intend to install something you should select YES to update sources. You don't need to if you only intend to remove something. (I find that dialogue is a little wonky about that specific case and should probably be eliminated and just automatically update sources every time.) Also you need an internet connection to update the sources.
TC
TC
All opinions expressed and all advice given by Trinidad Cruz on this forum are his responsibility alone and do not necessarily reflect the views or methods of the developers of Linux Lite. He is a citizen of the United States where it is acceptable to occasionally be uninformed and inept as long as you pay your taxes.