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I'm trying to install Ubuntu Server 13.04 from a USB drive onto an old Dell PC. I've installed from USB before on that system, so I know USB install should work. The installer stops when it tries to mount the CD. I looked through the installer messages and realized that it was mounting my hard drive as the CD, then failing because it contained no installer files. I tried mounting sdb1 (the USB key) manually with mount, but then the installer fails to install the kernel package "linux-generic". Any idea what I should do? Should I unmount the installation drive when prompted by the installer? Or something else?

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I think you should check the installation media for errors. Hit Check CD for errors. –  Braiam Sep 19 '13 at 1:27

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