After 1 year and half working like a charm today I have started getting this error.
I have home assistant supervised in docker on Debian 9 on a Lenovo mini-pc
All my home assistant work fine with the exception of add-ons installed via supervisor( e.g. node red automations are not fired )
Tried a reboot but did not help. I checked in Portainer and all docker images are correctly working
After trouble shooting I found out that apparmor was disabled ( not sure if that could be linked to a short power outage happened yesterday )
I fixed it by
Removing containers
running in terminal the command “export PATH=$PATH:/usr/sbin”
Re-adding containers with the curl command