ChromeOS is not a Linux Distro, it is a linux based OS however
It is only "Linuxy" in that it uses a custom/locked down Linux kernel much like like Android does.
Up until very recently there has not had any form of official compatibility with Linux applications, if you wanted to install a Linux you had to obtain specific distros and jump through hoops to install them, just like windows machines (more difficult to install in many cases due to harware driver issues eh touchpads).
Even now that there is some compatbility it is done via an optimised debian stretch virtual machine on top ChromeOS and is not native compatibility, additionally only very few Chromebooks currently have this compatbility at first switch on.
Chromebooks are by thieir nature more like Thin Client Devices than they are laptops, they have a very limited range of hardware compatbility - try using an optical drive with one or obaining a driver for a replacement/additional wireless device.
TL:DR ChromeOS and Linux Distros are like filter coffee machines and kettles, while they can both make coffee the chances of getting a decent cuppa tea from the coffee machine is near Zero as its designed to be a coffeemachine and nothing more.@r00tobo @fatboy