from: https://forum.proxmox.com/threads/ubuntu-snaps-inside-lxc-container-on-proxmox.36463/#post-230060
Snap requires a bit more work. There may soon be a ‘fuse’ flag for the features option, but fuse can be dangerous. For now you have to do this:
– For unprivileged containers:
1) Put this in /etc/pve/lxc/$vmid.conf:
Code:
...
features: mount=fuse,nesting=1
lxc.mount.entry = /dev/fuse dev/fuse none bind,create=file 0 0
2) Inside the container: `apt install squashfuse`