I try to download ubuntu-14.04.2 desktop from
But after whole downloading the iso image, when I getting to burn it to a CD or install on a bootable USB it says not probable image.
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Run the command:
Then compare the output to the correct version of your download on this list
This checks that the file isn't corrupted in any way.
Verify the image's checksum against the one provided by Ubuntu:
You can calculate the checksum by running