he installer encountered an error copying files to the hard disk:
[Errno 5] Input/output error
This particular error is often due to a faulty CD/DVD disk or drive, or a faulty hard disk. It may help to clean the CD/DVD, to burn the CD/DVD at a lower speed, to clean the CD/DVD drive lens (cleaning kits are often available from electronics suppliers), to check whether the hard disk is old and in need of replacement, or to move the system to a cooler environment.
In my case was resolved thanks to the fantastic advice from zoomy942 as follows:
1. Boot from the live CD
2. Choose to try Ubuntu
3. Open a terminal window
4. Enter: 'uniquity --no-migration-assistant'
5. Working install
more info:http://ubuntuforums.org/showthread.php?t=1142068
http://ubuntuforums.org/showthread.php?t=1207755&page=2