Problems installing 12.04.1

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http://askubuntu.com – I have been trying to get Ubuntu 12.04.1 (desktop-i386) running on my laptop. Have burned a boot-able CD containing 12.04.1. It allows me the option of Trying out Ubuntu before installing, but the installation fails. It cites an input/output error Errno5. I have tried burning another disc and using another USB disc drive, but they all give the same result as above. I then downloaded the alternate-i386 and loaded it onto a boot-able USB flash-drive. During installation, it produced an error as well, and selecting the option to check the CD's integrity produced the following: The ./pool/main (HowTos)