Comment 28 for bug 543875

After several hours and with none of the fixes on the net helping me, I managed to sort this, so thought I'd share my experience.
For me, I was trying to install using CDRom. To make it work I swapped the jumpers on the CDRom drive to make that the master and my hard drive the slave.
Before I did that everything I tried gave me the "unable to find a medium containing ..." error.
I couldn't use the USB method on my pc (too old). Another thing to check is that the CD burn worked correctly (make sure you burn at reduced speed and check the option to verify after burning to make double sure).
Hope this helps someone.