Open Disk Utility and wait for it to gather information about your disks. Method 1 - The easiest (if MD5 is available) is using the Disk Utility program (Applications > Utilities, or by choosing "Utilities" from the Finder's "Go" menu). There are three methods of using md5sumsum on an OS X machine. This should be updated by someone with access to a Mac. Go ahead and use it (or play frisbee with it if you want). Depending on your system, you may need to change cdrom to cdrom0 (or even cdrom1 if you have two CD drives).Ĭongratulations, you now have a verified Ubuntu CD. You can check the integrity of the CD without rebooting as follows.Ĭheck the calculated hash against UbuntuHashes as shown for the iso file above. Great, but if the CD is corrupt then you have already wasted time rebooting. When you boot from the CD you will be given the option to test its integrity. So far so good, you have downloaded an iso and verified its integrity. You may want to refer to the BurningIsoHowto page. Once you have verified the sha256 hash, go ahead and burn the CD. If the OK for your file appears, that indicates the hash matches. The sha256sum line should output a line such as: Then run the following commands in a terminal. If you continuously receive an erroneous file from a server, please be kind and notify the web-master of that mirror so they can investigate the issue.įirst download the SHA256SUMS and SHA256SUMS.gpg files to the same directory as the iso. You should download the file again from either the same mirror, or from a different mirror if you suspect a server error. If the hashes do not match, then there was a problem with either the download or a problem with the server. When both hashes match exactly then the downloaded file is almost certainly intact.
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