tried both, same resultAre you installing ubuntu directly from DVD or via USB?
Check the setup copy for any corrupted file. Download the latest iso from site.
The current version of Ubuntu seems to be 12.04. Is there any reason you would like to install 11.10? Sometimes newer versions would have fixed any bugs in older versions.
As suggested by sandip above, download and try with the 12.04 version.
I dont have PS/2 or USB keyboard/mouse. Can I make it work with wireless keyboard/mouse?Verify the checksum of the image (MD5 or SHA). If the checksum is OK unplug those wireless device(s) and use a PS/2 or USB keyboard/mouse.