Most questions that are on-topic here, are on-topic there too.

But it doesn't go the other way around. For example, questions about Linux Mint are on-topic there, but not here.

And if you post Ubuntu-specific questions there, you might get a comment saying something like "You might find more expertise on Ask Ubuntu".

I recommend that you ask Ubuntu questions here. (Even if you think the same question may apply to Mint, Elementary, etc.) If **your** question is about Ubuntu (or Xubuntu, Kubuntu, etc.), ask it here.

Here are some quotes from the tag descriptions for [Ubuntu][1] and [Kubuntu][2] at Unix and Linux SE:

> Note that http://askubuntu.com is specifically dedicated to Ubuntu questions.


<b>

> Questions for Kubuntu are probably better asked at http://askubuntu.com/, the stackexchange site for Ubuntu.


  [1]: http://unix.stackexchange.com/tags/ubuntu/info
  [2]: http://unix.stackexchange.com/tags/kubuntu/info