Erro ao instalar o snap

Já fiz de tudo e não consigo ter sucesso para fazer a instalação 100%.

sudo snap install core; sudo snap refresh core error: system does not fully support snapd: cannot mount squashfs image using “squashfs”: mount: /tmp/syscheck-mountpoint-730245928: mount failed: Operation not permitted. error: system does not fully support snapd: cannot mount squashfs image using “squashfs”: mount: /tmp/syscheck-mountpoint-730245928: mount failed: Operation not permitted.