It's not Linux(ish) it is a Linux distro, just as much as Raspberry Pi OS or Ubuntu is a linux distro.Kinda/sorta/practically yesHardly surprising that Chromebooks tend to "play nicely with Linux" really; since ChromeOS is essentially a Linux Distro...(as is Android). So, essentially; Chrome books are Linux laptops really.
I would go with "Linux'ish" since ChromeOS is not truly just spun off from one of the mainstream Linux distros, in the same way that other Linux distros have been. It is a Linux distribution developed and designed by Google. It is derived from the open-source ChromiumOS, based on the Linux kernel, and uses the Google Chrome web browser as its principal user interface. Since 2018, ChromiumOS/ChromeOS version 69 onwards also support Linux applications, which are executed in a lightweight virtual machine with a Debian environment. There is enough differences that I would claim Linux like or Linux adjacent rather than Linux... but that is just me.
However from a hardware support, anything that runs ChromeOS should be super simple to get a standard Linux distro up on.
According to Wikipedia...
"ChromeOS, sometimes styled as chromeOS and formerly styled as Chrome OS, is a Linux distribution developed and designed by Google. It is derived from the open-source ChromiumOS, based on the Linux kernel, and uses the Google Chrome web browser as its principal user interface."
Strictly speaking..."Linux" is technically just the Kernel. ALL Linux distros are the Linux Kernel plus various other bits of software...mostly taken from the GNU family. Chromium is no different really. Whilst it might have a different userland to many other distros; It's still essentially follows that same model.
I've installed more mainstream Linuxes on Chrome boxes without any great issue...as you say...It was "super simple"

Statistics: Posted by kip_the_elder — Fri Jul 05, 2024 8:44 am