Do you have any idea how often security vulnerabilities are discovered and fixed? It would be terribly impractical to release a new live ISO every time this happens, and no distro does this. New ISOs are either released when a new major version of the system is released, or in regular intervals of something like 6 months or a year. In the latter case, the purpose isn't to patch security vulnerabilities, it's to reduce the amount of time a new user has to spend installing updates, or in some cases to provide newer kernels so that the system can more easily be installed on newer hardware.

Making sure the system is up-to-date is why Ubiquity offers the option to download updates while installing. But even if the user chooses not to do this, the danger is minimal as long as updates are installed before too long.

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