New answers tagged chroot
You need to set your Chromebook into developer mode before the shell command will work. This is a pre-requisite to installing crouton and is documented on the first line of the prereq section of the guide you are following. How you do that will depend on your specific device; there are lots of guides out there.
You can run applications in separated environments via https://linuxcontainers.org/. Each application instance can have separate file systems, users, networking and so on.
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