"System does not fully support snapd" error message

I’m trying to install snapd.

Computer: Acer Chromebook 315

This is what comes up when I command cat /etc/os-release:

PRETTY_NAME=“Debian GNU/Linux 11 (bullseye)” NAME=“Debian GNU/Linux” VERSION_ID=“11” VERSION=“11 (bullseye)” VERSION_CODENAME=bullseye ID=debian

So I think I’m installing it on Debian…

I followed these instructions: https://snapcraft.io/docs/installing-snap-on-debian

But when I command sudo snap install core, I receive this message:

error: system does not fully support snapd: cannot mount squashfs image using “squashfs”: mount: /tmp/sanity-mountpoint-156157885: mount failed: Operation not permitted.

I don’t know what to do. Help would be appreciated.

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