Did I say something wrong?
Have I offended anyone?
Have I been rude?
Is docker support terminated?
I can’t get on with my educational project.
I changed PC and OS. I went from Windows 8.1 to Windows 10 and I can’t use “docker-machine ip” anymore. I get the same problem on any system (Windows 10 and Ubuntu 18.04).
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Now you have at least one responding to you. Btw I have the same kind of question but really I’ve just kept it in my mind (some kind of wondering, doubting …). Really learning docker is not easy when it comes to some advanced scenarios or encountering some strange issues. We can hardly find a quick supporting even in here 
Thanks for the reply, I had been waiting for someone for a word for days.
My questions are very simple, I’m simply asking how to install Docker!
It’s a simple question for you.
Besides, I have everything new. The PC is new (i3-8100), Windows is updated to the latest version (1809), Ubuntu is the penultimate version (18.04).
Docker Forums are … not very useful.
I would recommend someplace like stackexchange which has a much better structure. Good answers get upvoted. People have incentives to provide good answers. Questions which are answered are marked as answered. Most important: there seems to be a better balance between people asking and people answering.
do you mean about StackOverflow? 
I think in this field of docker, both are just the same. There is very less support from both sites. StackOverflow may be better a bit in responding but almost are just comments. Finding an answer is not easy.
Without good support the software cannot be used.
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I guess you’ll surely get a quick response when you become a paid user to any software. The community edition of software not always gurantee instant response or solution.
Well of course instant response is something we usually must pay for but here even a response after days of asking is still scarce 
Actually you can find free instant responses in some Q&A site like StackOverflow BUT not all the fields have that same kind of quick response (such as for this field of docker - it’s much like this forum in how silent it is 
).
This forum looks almost like inactive 
Really I post the questions to help tracking what issues I’ve had, not really hope for an answer here
I don’t want to criticize the program nor the forum. Docker is a company that makes its choices. As a student I cannot pay for assistance. A professional probably does. Of course if I receive assistance and I become practical with Docker CE it is likely that I will decide to use Docker EE in the future. The vice versa is also true. However, they are business choices. I will look for answers on other forums but I am stunned. I believed that Docker was happy to have new admirers.
Thanks to everyone and have a nice day