This is probably another instance of the problem seen in bug 855793, pointing the blame back to dpkg. (The pty code didn't change at all between 11.04 and 11.10, and packagekit is seeing the same issue.)
This is probably another instance of the problem seen in bug 855793, pointing the blame back to dpkg. (The pty code didn't change at all between 11.04 and 11.10, and packagekit is seeing the same issue.)