Accidentally, when searching for something systemd related, dlm.service caught my eye, and surprisingly, it was rather in a HW support in Linux SW enablement context. Briefly looking into the Ubuntu driver that allegedly contained that file (or recipe to create it, actually), I've realized the respective installer would simply overwrite the regular cluster DLM related service file without any hesitations (unless I miss something).
So take this as a heads-up to watch out for that circumstance, three letter acronyms are apparently not very namespace-collision-proof. I logged this with their "Feature Suggestion" asking for more carefulness: https://support.displaylink.com/forums/287786-displaylink-feature-suggestions/suggestions/36068896 -- Jan (Poki)
Description: PGP signature