I am running Ubuntu 18.04 daily with a snap of Cumulonimbus installed with has the gsettings interface defined.
I have raised this bug on Launchpad
I see the following AppArmor denial in syslog when starting the Cumulonimbus snap.
Dec 18 17:57:00 skull kernel: [13377.665029] audit: type=1400 audit(1513619820.043:915): apparmor="DENIED" operation="file_mmap" profile="snap.cumulonimbus.cumulonimbus" name="/home/martin/.config/dconf/user" pid=25541 comm="cumulonimbus" requested_mask="m" denied_mask="m" fsuid=1000 ouid=1000
snap version outputs:
snap 2.29.4.2
snapd 2.29.4.2
series 16
ubuntu 18.04
kernel 4.13.0-17-generic
The snapcraft.yaml for Cumulonimbus is available here: