17.10 here, same error with mariadb-server: Nov 07 10:08:20 pc770 audit[23211]: AVC apparmor="DENIED" operation="sendmsg" info="Failed name lookup - disconnected path" error=-13 profile="/usr/sbin/mysqld" name="run/systemd/notify" pid=23211 comm="mysqld" requested_mask="w" denied_mask="w" fsuid=124 ouid=0 Nov 07 10:08:20 pc770 kernel: audit: type=1400 audit(1510045700.070:89): apparmor="DENIED" operation="sendmsg" info="Failed name lookup - disconnected path" error=-13 profile="/usr/sbin/mysqld" name="run/systemd/notify" pid=23211 comm="mysqld" requested_mask="w" denied_mask="w" fsuid=124 ouid=0
17.10 here, same error with mariadb-server: "/usr/sbin/ mysqld" name="run/ systemd/ notify" pid=23211 comm="mysqld" requested_mask="w" denied_mask="w" fsuid=124 ouid=0 0.070:89) : apparmor="DENIED" operation="sendmsg" info="Failed name lookup - disconnected path" error=-13 profile= "/usr/sbin/ mysqld" name="run/ systemd/ notify" pid=23211 comm="mysqld" requested_mask="w" denied_mask="w" fsuid=124 ouid=0
Nov 07 10:08:20 pc770 audit[23211]: AVC apparmor="DENIED" operation="sendmsg" info="Failed name lookup - disconnected path" error=-13 profile=
Nov 07 10:08:20 pc770 kernel: audit: type=1400 audit(151004570