What is the meaning of the error message "Xenial Xerus deprecated" when encountering a build error on Netlify?

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The error message "Xenial Xerus deprecated" on Netlify indicates that the build system is no longer using Ubuntu Xenial Xerus as its base image for building and deploying websites. This may cause compatibility issues with some dependencies or packages that were specifically designed to work with Xenial Xerus. It is recommended to update the dependencies or packages to work with the new base image, which may be a more recent version of Ubuntu.