Installation problem with 15.4

[Marc Tremblay]

Good morning,

I tried installing 15.04 on a Toshiba C850 with 4GB ram and 300 GB hard drive. The installation starts fine but then I get an error message telling me that there's an input error and that the CD/DVD drive has a problem. The error occurs even though I am using a USB ISO image for the installation. I have had no problems installing 14.10, 14.4 and 12.04 on the same laptop.

Thanks
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