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Step 2: Generate SHA256 checksum of the downloaded ISO file It contains the checksum of the original file provided by Ubuntu. Once you find the file, click on it to open it. I am using the below mirror to download SHA256SUMS file: The mirror page includes some extra files along with Ubuntu images. You will need to find SHA256SUMS file from official Ubuntu mirrors. The steps of the method are as below: Step 1: Download SHA256SUMS file
#Verify ubuntu download verification#
Hashing is the process of verification that verifies if a downloaded file on your system is identical to the original source file and has not been altered by a third party. In the first method, we will use hashing to verify our download. The second one is through gpg keys that is a more secure method of checking file integrity. The first method is through SHA256 hashing that is a quick but less secure method.
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There are two methods you can use to verify the integrity of downloaded files. Moreover, I have downloaded ubuntu-18.04.2-desktop-amd64.iso and it will be used in this article for the verification process. For this article, I am using Ubuntu 18.04 LTS for describing the procedure. In this article, we will walk through a few steps that will help you to verify any download in Ubuntu operating system. It is highly recommended to verify the checksum when downloading a file from any third party. It is particularly useful when you are downloading a file from somewhere else rather than the original site like third-party websites where there is a greater chance of tampering with the file. Using checksum of the file, you can verify that the downloaded file is authentic and has not been tampered. What is that link for? Actually, Linux distributions distribute checksum files along with source ISO files to verify the integrity of the downloaded file. While downloading, you might also notice a link to download checksum file. You may have often downloaded some open source software, for instance, various Linux distributions ISO.