Comment 4 for bug 1630145

Running df -h gives an idea about the available space and then I used the fallocate like

fallocate -l 6G tempfile, e.g. to allocate 6G of writable area

but that won't be enough you may have to install some snaps afterwards to occupy the remaining/reserve space before you reach to the point where it starts giving 'cannot communicate with server' error.