Thank you for taking the time to report this bug and helping to make Ubuntu better. Please answer these questions:
1. Is it possible that pressing the "Enter" button actually cancels the operation you want to perform?
2. Have you tried to do it with the mouse instead of keyboard?
3. If nothing else helps, please attach few screenshots to the report, so they explain your problem.
Thank you for taking the time to report this bug and helping to make Ubuntu better. Please answer these questions:
1. Is it possible that pressing the "Enter" button actually cancels the operation you want to perform?
2. Have you tried to do it with the mouse instead of keyboard?
3. If nothing else helps, please attach few screenshots to the report, so they explain your problem.