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Split (root+home) into / and /home, with limited space

I have a system with a single (/+/home) partition, with 275Gb and 18Gb free. As per du, my /home takes 221Gb, so / would be about 36Gb. I want to split it into / and /home partitions.

Besides the fact that would first free some, say, 40Gb, to lessen the burden, is there any way to partition other than copying all /home somewhere else where I have those ~200Gb available?

The "classical" recipe (e.g., 1, 2, 3) uses that, and implies ending with / with 275Gb and /home with ~200Gb. Of course, I could then remove home_old, reduce the size of /, create a new partition in the freed space, and copy /home back in the new partition (which would also free the auxiliary ~200Gb). That is my current plan, but I have to get those extra 200Gb, currently not available. I mean to avoid that, if possible at all.

waltinator avatar
it flag
Yes, probably, BUT it requires a familiarity with with disks, partitions, filesystems, their structures, tools for working with all of the above, a Live USB, and a willingness to risk losing all your data. How's your power reliability? Air conditioning? Attention span?
sancho.s ReinstateMonicaCellio avatar
@waltinator - Assuming I have the resources, what is the suggested method?
waltinator avatar
it flag
Comments are designed for US to ask YOU questions about your Question. You should [Edit] your question to add information. By updating your Question, and using the formatting buttons, you make all the information available to new readers. People shouldn't have to read a long series of comments to get the whole story. AskUbuntu is not a conversation site. If you're well educated enough, the method suggests itself. If not, it's like disarming a bomb with the expert on the telephone.
sancho.s ReinstateMonicaCellio avatar
@waltinator - Of course I am willing to edit my question with whatever information people willing to help ask about. I apologize I missed what is it you mean that I add, would you mind clarifying? I guessed you didn't mean that I add details in the OP about my air conditioning, attention span, etc. But I might have gotten it wrong.
waltinator avatar
it flag
It's too dangerous (for you), and I won't risk my honor on it. You will lose data. Use the referenced methods.
sancho.s ReinstateMonicaCellio avatar
pl flag
@waltinator - Ok fair enough. I wouldn't see how describing a method, however dangerous (with due warnings), might risk your well-earned honor (your answers and comments are always a reference). There are plenty of such posts around (SE and others), by quite reputable people. You won't, by any means, be possibly held responsible for whatever data loss I suffer. But of course, I respect your choice. PS: I already reduced my `/home` to the point that I have technically enough room to resize and make the transfer in my own drive.
sancho.s ReinstateMonicaCellio avatar
[This](https://askubuntu.com/a/18525/226614) should work.
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