md5sum -versionīoth these commands should output some version information. If this is the first time you have run gpg, this will create a trust database for the current user. You can check the commands work as expected by running the following: gpg -list-keys All versions - check the commands are working!

If you don’t have them, check with your package manager and search for the executable names given above. Your mileage may vary, but these are standard tools included and enabled by default in most systems. The sha256sum program and other useful utilities are provided by coreutils: brew install coreutils You can install the latest GnuPG using Homebrew: brew install gnupg If you are using bash on Windows 10 (why on earth not? See this tutorial), these tools are part of the default install. These are part of the coreutils and gnupg packages, which are installed by default. The key executables you will require are sha256sum, md5sum and gpg. Originally authored by Canonical Web Team Necessary software

Internet access to download the signatures.

How to use sha256 tools to verify the integrity of a file.

How to use gpg tools to verify the authenticity of a file.

While we hope you can usually trust your Ubuntu download, it is definitely reassuring to be able to verify that the image you have downloaded is not corrupted in some way, and also that it is an authentic image that hasn’t been tampered with.

Verifying your ISO helps insure the data integrity and authenticity of your download.

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