I also have had problems after the partial upgrade offered by the Update Manager on Ubuntu 10.04. I am using the Samsung SCX-4623F printer. I scanned one document (using Simple Scan) immediately before the partial upgrade and another page of the same document immediately afterwards. The first scan (A4 page size) was normal. In the second scan the page size had changed to what I think must be Foolscap size and it cannot be changed. Is there any way to correct this?