Validating image checksum christian dating richmond va
When one has downloaded an ISO file for installing or trying Ubuntu, it is recommended to test that the file is correct and safe to use.
The MD5 calculation gives a checksum (called a hash value), which must equal the MD5 value of a correct ISO.
Beware, it can take a long time so don't worry if your terminal seems to have hung; provided the CD drive is still accessing, it is probably still working.
It should not output anything if it there were no errors, and an error message if a file failed the check.
You should download the file again from either the same mirror, or from a different mirror if you suspect a server error.
If you continuously receive an erroneous file from a server, please be kind and notify the webmaster of that mirror so they can investigate the issue.
In terms of integrity, an MD5 hash comparison detects changes in files that would cause errors.
More recent hashes may be available at : choose the relevant distribution and click on the MD5SUMS file.
This verification software has some useful features, but it is easy to understand and very easy to use. If the command outputs any errors, you'll know that either the burn was bad or the is corrupt.
Please note that this method does not verify authenticity unless the hash of the iso file is compared to the hash at the secure Ubuntu Hashes page.
You could open up your favorite graphical file manager such as Nautilus or Dolphin, but since you need to use the command line anyways, you might as well use ls.
Now that we know the size of our iso image is 732766208, we can use dd to pipe only 732766208 bytes from our cdrom device into md5sum.