I suggest to remove apparmor and snapd, reboot, then install it again.
I had a relatively similar error with apparmor as @brent had.
My procedure was to remove apparmor first with
sudo eopkg rm --purge apparmor it will remove apparmor and any configuration with it, eopkg will suggest to remove snapd because of dependency with apparmor, remove it too, then reboot.
At this point Solus will run without apparmor and snapd.
Finally install apparmor with
sudo eopkg it --reinstall apparmor, I don't consider
--reinstall necessarily important but just in case, you can use
sudo eopkg it apparmor thought, then you can try to install snapd and run
sudo usysconf run -f the output would be clean of errors. hopefully it will work.