When you've let Launchpad know that bug X affects you and someone marks bug X as a duplicate of bug Y, bug Y doesn't affect you.
All people affected by bug X should also automatically be marked as affected by bug Y.
When you've let Launchpad know that bug X affects you and someone marks bug X as a duplicate of bug Y, bug Y doesn't affect you.
All people affected by bug X should also automatically be marked as affected by bug Y.