Error: system does not fully support snapd (on debian)

help! i need help installing a snaps package, and it didnt work, here is my output.
error: system does not fully support snapd: cannot mount squashfs image using
“squashfs”: mount: /tmp/sanity-mountpoint-626343922: mount failed:
Operation not permitted.
(i use debian 10)

Is this a Debian system installed from install media, or a derivative provided by some third party?

This is with crostini.

Okay, so you’re running up against limitations in the ChromeOS kernel (which you wouldn’t see with a Debian kernel). This thread has some information from someone who managed to get things working in this environment:

It’s about a year old and I haven’t personally tried those steps, but it might help get you going.