Hello. I have Fedora 9 installed on my Acer Aspire 1640z and I am trying to install Ubuntu 8.04. However when trying to install I get one of two errors. The first one is after the Ubuntu loading screen and it posts in a command line like interface:

Buffer I/O error on device sr0. logical block 0
or
Buffer I/O error on device sr0. logical block 1

The other error is it loads into the first gui install page but the mouse freezes up and the list goes of the page so you cannot click the continue button. I have checked the disk for defects and its fine.

Any help would be much appreciated. Take note that Fedora 9 and 8 have both worked on the system, so I don't see why this shouldn't.