Comment 6 for bug 1817799

I've confirmed that the "Could not open '/var/lib/snapd/apparmor/snap-confine'" is not present in standard install of disco. This was a local issue.

I've also updated the packaging to remove the "dpkg: warning: unable to delete old directory '/etc/apparmor.d/cache': Directory not empty" message. postinst was doing the cleaning so the end result was ok, but we can be better.

Thanks Adam for the review!