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Ubuntu Core Desktop Delayed, Won't Be Released in April
(www.omgubuntu.co.uk)
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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.
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I don't believe iOS and Android use immutable filesystems to the extent some Linux distros do, like openSuse Aeon, Fedora Silverblue, Nixos, etc. iOS and Android just make it more difficult to gain root access.
They do. By default the system partition is straight up mounted read-only.