Comment 24 for bug 1620771

> cat /etc/apparmor.d/tunables/home.d/ubuntu
> # This file is auto-generated. It is recommended you update it using:
> # $ sudo dpkg-reconfigure apparmor
> #
> # The following is a space-separated list of where additional user home
> # directories are stored, each must have a trailing '/'. Directories added
> # here are appended to @{HOMEDIRS}. See tunables/home for details.
> @{HOMEDIRS}+=/home/server/files/users/

> sudo apparmor_parser -r /etc/apparmor.d/*snap-confine*
> sudo apparmor_parser -r /var/lib/snapd/apparmor/profiles/*

> Note the following seems to have stripped /users/ off the above
> directory:

> Nov 22 16:42:29 desktop kernel: [ 2875.968601] audit: type=1400
> audit(1542901349.258:67): apparmor="DENIED" operation="open"
> profile="/snap/core/5897/usr/lib/snapd/snap-confine"
> name="/home/server/files/" pid=6254 comm="snap-confine"
> requested_mask="r" denied_mask="r" fsuid=5001 ouid=0

What this in fact shows is that something is trying to access /home/server/files/ and is denied access. Do you perhaps have users who have a home directory of /home/server/files? Or, are there symlinks somewhere pointing to /home/server/files as the target? From your description of your setup, it is not expected that snaps are trying to access /home/server/files directly.