When I type snap in my terminal I get this normal output:
`~ $ snap
The snap command lets you install, configure, refresh and remove snaps.
Snaps are packages that work across many different Linux distributions,
enabling secure delivery and operation of the latest apps and utilities.
etc etc etc'
I looked in my software center and there are 3 squash packages. The only one (on budgie) that is installed is squashfs-tools.
For a basic package retrieval program, I would've never thought it would need a mount point. Seems a corrupted directory or file. Hope someone steps in; that's all I've got.