There’s no such thing as as setting up Votifier/NuVotifier with MineOS. Or at least it would be no different than Debian or Ubuntu, but typically you won’t see plugin setup tied to the OS because they don’t really interfere with eachother at all.
The most that could happen is that MineOS comes shipped with firewall rules, which many distros might ship with NO RULES. In which case, you can turn off MineOS’ firewall (or more accurately, make it so the firewall does not reject traffic), and then any other tutorial you see on the internet should likely become relevant again.
I’ve never worked with Votifier, but I insist on making this clear: MineOS is like Ubuntu (with the MineOS webui) or Debian (with the MineOS webui)–it is simply the OS. MineOS does not have any special system for installing Spigot plugins.
Nothing about the branded OS is making votifier more difficult to set up, but if you think you’d be more successful with setting it up on Ubuntu, you can definitely do so–and still use the MineOS webui.
This is now your third post asking for help on votifier, and I’m sorry that you’re struggling to get it up and working, but understand we’re not experts in every part of Minecraft, so that would explain the little attention each post is getting.
That and until this point, we have no clear information of what you have tried and where you’ve actually run into issues. We have no idea if you’re having a firewall issue or if you’re having a plugin issue or if you’re having a …whatever. We don’t know if you’ve downloaded the plugin and successfully moved it to the server’s directory, we don’t know if you downloaded the necessary profile for spigot and that spigot actually runs. We really don’t know anything about where you’re at–and that definitely factors in to how little attention this question is getting.