When you download an ISO file, look for a corresponding md5sum file (if available) and after you download the ISO file, run the md5sum command against it:
$ md5sum filename.iso
If the md5sum does not match that posted on the download website, then your download is corrupt and you need to try again until you get a good download.
That done and verified, here's how to use Linux commands to burn the image:
1) First, always run the following command to ascertain the SCSI bus ID for your CD or DVD device, since on the next boot the device may be mapped differently (this step will avoid the problem of addressing the wrong device address):
$ sudo cdrecord -scanbus
Your CD or DVD device might have a SCSI address of: 0,1,0 or 2,1,0 or something like that as output
2) Next, since you have already verified the ISO image file (using md5sum), for the purpose of this example, let's assume your device was 2,1,0, then put a blank CD+RW disc or reuseable DVD into your CD drive and issue the following command:
If there is data on the CD - you need to blank it out before burning it again (i.e. CD+RW disc):
$ sudo cdrecord -eject -v speed=8 blank=fast dev=ATAPI:2,1,0
If the CD or DVD is blank already, you can skip to the following command:
$ sudo cdrecord -eject -v speed=8 dev=ATAPI:2,1,0 ./imagefile.iso
-- Tom
__________________
The independence created by philosophical insight is - in my opinion - the mark of distinction between a mere artisan or specialist and a real seeker after truth. - Einstein wrote in 1944.
Some say knowledge is power, I say knowledge without action is powerless. - lotuseclat79
Don't confuse action with movement. - Hemingway to Gardner
Imagination is more important than knowledge. - Einstein | 
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