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Jail had no marketing hook. It's a very negative word. I'd guess that's Probably the major reason.

Well that and it wasn't done by a VC backed firm with strong press connections.

> Somehow "jails" didn't stick

I hear chroot jail tossed around a fair amount.

Jails is typically the FreeBSD name for a very similar concept. Linux "copied" (using the term very loosely) the idea, but not the name.

I was running a couple of jails on my FreeBSD server 15 years ago.. Worked like a charm.. But eventually I switched to linux.