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What's the difference between Super User, Unix and Linux, and Ask Ubuntu? In general, what's a rule for deciding where to post a question when I have one (which might apply to any of those 3)? If I'm having a problem with Linux Mint, which seems likely to be the same in Ubuntu, is it appropriate to post it on Ask Ubuntu?

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    The problem with statments like "which seems likely to be the same in Ubuntu" is how sure are you if you don't already know the answer? – dmckee May 15 '12 at 21:01
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    In this case it's actually because I was planning to ask a question when I was using Ubuntu, but didn't get around to it. Last night I installed Mint for the first time and then today found that I still had the same problem. Since I don't regularly change operating systems, I probably won't know whether the problem exists in Ubuntu as well, but in this one case I do know that it does. – dspyz May 15 '12 at 21:08
  • Short version: Yes, sites overlap, and that's OK. :) – Matthew Read May 15 '12 at 21:46
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    Actually, I dislike that overlap, @Matthew, like I dislike Ask Different existing next to Super User too. But well. – Arjan May 15 '12 at 21:47
  • @Arjan It makes me feel uncomfortable as well, but I am able to recognize that's merely due to my CDO :P – Matthew Read May 15 '12 at 22:50
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    I have a similar problem: I can't tell the difference between SuperUser and ServerFault when I'm voting to migrate a question. – Rob Jun 12 '12 at 23:06
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    @gnat: Why do you keep flagging overlapping-site-scope questions as dupes of that faq when they're not about CS at all, and the only mention in the single answer of their actual issue is a link or so to a blog that discusses it? That's not a duplicate question or suitable answer for a dupe. Maybe the faq should be adjusted to discuss all such site scope questions, but do that first. – Nathan Tuggy Mar 29 '16 at 17:51
  • @NathanTuggy you are right, I retracted my vote before it closed and voted to reopen – gnat Mar 30 '16 at 7:59
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    @gnat: Good to hear! – Nathan Tuggy Mar 30 '16 at 8:03
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    Not a duplicate IMO. Reopened. – ShaWiz Mar 30 '16 at 14:21
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Ask Ubuntu is for (from their FAQ):

  • Using and administering Ubuntu, including official Ubuntu derivatives.
  • Running third-party applications on Ubuntu.
  • Development on Ubuntu.
  • Services provided by Ubuntu
  • Any question not mentioned below or here are great! There are no "dumb" questions!

Also from their FAQ:

This is not the right place for:

  • Linux Mint, Backtrack, and other Linux distributions (try our friends at Unix & Linux Stack Exchange).

(Emphasis mine)

In general, AU is for Ubuntu, Lubuntu, Kubuntu, Xubuntu...etcetera, while U&L is open to all other distros (while Ubuntu is acceptable there, if you only care about Ubuntu, you'll get more focused answers on AU).

In your case, I would ask on Unix & Linux.

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    So you're saying so long as I'm working on Linux Mint, I should ask all my questions relating to installing anything on the Unix-and-Linux stack exchange, because superuser is for anything not Unix-and-Linux – dspyz May 15 '12 at 21:03
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    @dspyz That is just not true. Super User is for Unix and Linux. Decide where you want to post, it's up to you. – slhck May 15 '12 at 22:00
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    @dspyz Most Unix & Linux questions are also on-topic on Super User, but not all: Super User rejects mobile phones, tablets, embedded systems other than home routers, questions that are too server-y, questions about Hackintosh, and is not very accepting of questions that ask why and not how. – Gilles Jun 12 '12 at 19:42
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The FAQ for all three sites seems to cover it pretty well.

Super User concerns itself with computer hardware, software, and personal home computing/networking; Unix and Linux concerns itself with *nix operating systems (not specifically a particular distro); and Ask Ubuntu concerns itself with questions in regards to Ubuntu and its official derivatives.

To answer your question more pointedly:

[Ask Ubuntu] is not the right place for:

  • Linux Mint, Backtrack, and other Linux distributions (try our friends at Unix & Linux Stack Exchange).

...so you'd do well with Unix and Linux.

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