You got Input/Output error during cp read of /media/cdtmp.Rf6276, which
I guess is the loopback mounted ISO 9660 file system image.  The most
common cause of this is truncation of the image, especially if the files
on which it occurs are near the end of the image.

checkisomd5 is missing.  Install it from package isomd5sum on Ubuntu.

There may be other tools missing.  Use script command to capture all the
output as text, so we can have another look.

James Cameron
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