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I am following the steps here to rebuild a kernel on a VM: https://wiki.ubuntu.com/Kernel/BuildYourOwnKernel

I have a .config file that I want to use to build it. Where should I put this .config file so that when I type make it uses that? The source I'm building from is linux-lts-utopic-3.16.0, and I'm using the debian folder in that.

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The.config file needs to be present in the base directory of a kernel source code which you are going to compile using make utility. Go to base directory and type ls -a the .config file should be there (probably in /usr/src/).

This is a blog for compiling a kernel from source (not ubuntu specific). https://prashantchikhalkar.wordpress.com/2015/05/07/linux-kernel-compilation-from-source-to-running/

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If your source file in /usr/src/linux copy .config file into /usr/src/linux and run make oldconfig instead make menuconfig then run make to compile your kernel.

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  • Thank you for your answer - I have two "linux" folders in /usr/src/. One of them is linux-headers-3.16.0-30, and the other is linux-headers-3.16.0-30-generic. How do I tell which one is in use? – user3475234 Aug 5 '15 at 14:14
  • It's none of them, they are headers files. You can download any source tarball from kernel.org and extract them anywhere you like in /home directory and follow the above steps. – kenn Aug 5 '15 at 15:16
  • @user3475234 - if you want to check which kernel is in use, just type uname -r it'll give you your running kernel version. If you are trying to learn how to compile a kernel please do it in your /home folder not in /usr/src/ – Prashant Chikhalkar Aug 6 '15 at 5:31

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