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This error is related to incompatibilities between the CD media and certain brands of CD readers.

My Pioneer DVR-216D with the latest 1.09 firmware seems to be one of them. My old NEC DVD burner doesn't like it either. However, an old external I/O Magic CD burner works fine! You might also try copying the files to portable media like a flash drive on a computer with a CD reader that works and then installing it on the target computer via flash drive. Not sure if that will work.

My best guess is that MS/Big Games got a great deal on this media. It has trouble reading files at the edge of the track on my ...

Get it while it's hot.

http://releases.ubuntu.com/karmic/

I only recently discovered why it is so dangerous to make crontab -e and crontab -r do such different things and yet be so close together on the US keyboard layout. The first command allows you to edit your cronjobs in your favorite editor, while the second one erases your list of jobs without hesitation.

To prevent this problem, I recommend two things. First, regularly back up your /var/spool/cron/[username] file, which is where this data lives. Second, alias crontab -r to crontab -ri, which prompts to make sure you actually want to do that.