Hi all, on zorin 17.3 Core there is something above the root???
the case:
I installed waydroid in the wrong mode, by my inexperience i placed the Vanilla instead the GAPPS so no Gplay store and no way to have it, need to restart from zero with gapps this time...
Unistalled waydroid following the waydroid docs, serach and delete any single file remained on the disk but in /sys/fs/cgroup/system.slice I still have a directory with waydroid files inside and I was unable to delete nor the files neither the directory with the usual sudo in angelo@angelo, so I change to root and give in a bash "rm -rf waydroid-container.service" as shown in the screenshot below
Zorin answer was: impossible remove 'waydroid-container.service/xxx.xxx' : operation not allowed
As root!!!!! Not Allowed????? What will be more powerful than a root to delete this last waydroid crumbles?
No, there isn't anything beyond the root user in terms of permissions. But this isn't a matter of permissions; you're trying to delete files from the /sys directory which is a special file system that acts as an interface to the kernel, and you cannot modify it.
It's possible that simply restarting will make it go away, but just to be sure disable any service with something like (double check the names of the services, these are just examples):
sudo systemctl disable waydroid
sudo systemctl stop waydroid
And then delete any Waydroid systemd service files you find in either of these locations:
/etc/systemd/system/*
/run/systemd/system/*
/lib/systemd/system/*
Dunno why but only after a third reboot the directory was been removed. I did a first one after the manual erasing of all the waydr* files everywhere on the disk and the "sudo rm -rf" on that directory; Going again on that folder and seeing sudo was not able to delete it I look on the web how to be root (yes, I'm so nooooob 
...), set again the "rm -rf" command beeing root but always without fix so did a second reboot and post here in forum my doubt why root cannot act as a totalcommander on that folder, then after your answer I checked waydroid with systemcontrol and searching to delete files with nautilus from the higher place (root@angelo:/$) with root privilege (nothing found) and at the end give again the rm -rf just to do. Third reboot, folder has gone away!