I'm running pihole on a Synology Diskstation with Debian chroot running.
To install, I followed instructions here
Now, per your suggestion I tried (from a Putty terminal)
root@DiskStation:/# sudo systemctl -I status dnsmasq
systemctl: invalid option -- 'I'
Being a bit of a noob much of what I am doing is only half-understood, so I appreciate your patience and further insructions. i.e. how would I determine if the DiskStation is running NetworkManager ?